Publications
| Title | Abstract | Year(sorted descending) Filter | PMID Filter |
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| endectocide activity of a pour-on formulation containing 1.5 per cent ivermectin +0.5 per cent abamectin in cattle. | the present work aimed to evaluate, through ten different studies, the therapeutic efficacy of a new pour-on formulation, containing 1.5 per cent ivermectin +0.5 per cent abamectin, against parasites of cattle. results obtained on trials against rhipicephalus (boophilus) microplus showed that the pour-on combination of 1.5 per cent ivermectin +0.5 per cent abamectin obtained superior efficacy indexes against this ectoparasite, when compared with formulations containing 0.5 per cent ivermectin, 1 ... | 2015 | 26392893 |
| activity of ivermectin long-acting injectable (ivomec(®) gold) in first-season grazing cattle exposed to natural challenge conditions in germany. | the persistent activity of ivermectin long-acting injection (ivm lai; ivomec® gold, merial; 3.15% ivermectin w/v) against nematode infections of cattle was evaluated under natural challenge conditions. seventy nematode-free brown swiss calves were blocked by pre-treatment bodyweight and allocated randomly to seven groups of 10 animals each: saline (control) at 1 ml/50 kg bodyweight once on day 0 or ivm lai at 1 ml/50 kg bodyweight (630 mcg ivm/kg) on either days 0, 7, 14, 21, 28, or 35. after ho ... | 2015 | 25280515 |
| multispecies resistance of cattle gastrointestinal nematodes to long-acting avermectin formulations in mato grosso do sul. | the use of long-acting avermectins (avms) in cattle to treat infections with gastrointestinal nematodes was common in brazil until its prohibition by state authorities. the prohibition; however, was rescinded in 2015, but a scientific discussion of the pros and cons of the use of these formulations is necessary. we evaluated the levels of resistance to 1.0 and 3.5% doramectin and to 3.15% ivermectin in cattle. the worms in animals treated with 3.5% doramectin were characterized by the suppressio ... | 2015 | 26129974 |
| nematode resistance to ivermectin (630 and 700μg/kg) in cattle from the southeast and south of brazil. | two high doses of ivermectin (630μg/kg and 700μg/kg) that are sold commercially in brazil were evaluated in dose-and-slaughter trials with 144 naturally nematode-infected cattle from eight regions within the states of minas gerias, são paulo and rio grande do sul in brazil. treatment groups were based on fecal egg counts 1, 2, and 3days before treatment; all animals studied had a minimum egg count of at least 500 eggs per gram of feces (epg). post-mortem analyses were conducted on day 14. the hi ... | 2014 | 25130588 |
| evaluation of clinical safety and anthelmintic efficacy of aurixazole administed orally at 24 mg/kg in cattle. | the current study evaluated, in vivo, the clinical safety and the anthelmintic efficacy of 24% aurixazole (24 mg/kg), administered orally, in bovines. two experiments were conducted: the first one evaluating the clinical safety of 24% aurixazole (24 mg/kg) in cattle, and a second one evaluating the anthelmintic efficacy of aurixazole (24 mg/kg) against gastrointestinal nematodes on naturally infected cattle. based on the results of clinical safety, no alterations on clinical and haematological s ... | 2014 | 24656344 |
| identification of chabertiidae (nematoda, strongylida) by pcr-rflp based method: a new diagnostic tool for cross transmission investigation between domestic and wild ruminants in france. | we describe a pcr-rflp-based method that allows reliable identification of four species of nematode parasites presenting similar infective third-stage larvae (l3) with a flagelliform tail and more than 16 intestinal cells, commonly observed in gastrointestinal tract of ruminants in france. molecular analysis of the second internal transcribed spacer (its2) of ribosomal dna, considered as a specific marker for strongylida, revealed four robust monophyletic clades corresponding to species chaberti ... | 2014 | 25194240 |
| the parasitic fauna of the european bison (bison bonasus) (linnaeus, 1758) and their impact on the conservation. part 1. the summarising list of parasites noted. | during the current century, 88 species of parasites have been recorded in bison bonasus. these are 22 species of protozoa (trypanosoma wrublewskii, t. theileri, giardia sp., sarcocystis cruzi, s. hirsuta, s. hominis, s. fusiformis, neospora caninum, toxoplasma gondii, cryptosporidium sp., eimeria cylindrica, e. subspherica, e. bovis, e. zuernii, e. canadensis, e. ellipsoidalis, e. alabamensis, e. bukidnonensis, e. auburnensis, e. pellita, e. brasiliensis, babesia divergens), 4 trematodes species ... | 2014 | 25119348 |
| gastrointestinal nematodes in grazing dairy cattle from small and medium-sized farms in southern poland. | this study aimed to estimate the prevalence of gastrointestinal nematodes and the intensity of infection in grazing dairy cattle from small and medium-sized farms in southern poland. the level of antibodies against ostertagia ostertagi in the bulk tank milk (btm) from the animals was also assessed. rectal fecal samples collected from 361 cows on 20 farms were examined using willis-schlaaf flotation and the mcmaster method. btm samples were tested for the presence of o. ostertagi antibodies using ... | 2013 | 23958284 |
| control trial and fecal egg count reduction test determinations of nematocidal efficacies of moxidectin and generic ivermectin in recently weaned, naturally infected calves. | an anthelmintic efficacy study was performed with young, naturally infected beef-type calves obtained at local farms. presumably, the study calves had been recently weaned and had not been treated with a parasiticide prior to study acquisition. after blocking the 24 study calves in accordance with calculated cooperia spp epg counts, the calves were randomly allocated within each block to one of four treatment groups, resulting in 6 animals per treatment group (untreated controls, topical ivermec ... | 2013 | 23380250 |
| resistance against gastrointestinal nematodes in crioulo lageano and crossbred angus cattle in southern brazil. | gastrointestinal nematode (gin) infection is a major cause of production losses in cattle. this study was carried out to evaluate the natural resistance against nematode infection in crioulo lageano and crossbred angus male calves. crioulo lageano is a local cattle breed in the state of santa catarina, in southern brazil. ten weaned calves of each breed were grazed together on pasture and naturally infected with nematodes between july 2009 and december 2010. once every 28 days, we collected feca ... | 2013 | 23177359 |
| reevaluation of efficacy against nematode parasites and pharmacokinetics of topical eprinomectin in cattle. | a study was conducted to confirm the efficacy of topical eprinomectin against nematodes and to evaluate the pharmacokinetics in cattle prevented from having physical contact with other cattle and from self-grooming. sixteen male brown swiss calves were infected with larvae of recently isolated nematode parasites. inoculation was scheduled so that the nematodes were expected to be adults at the time of treatment. animals were blocked based on pretreatment body weight and randomly allocated to the ... | 2012 | 22638921 |
| parasites of captive fallow deer (dama dama l.) from southern poland with special emphasis on ashworthius sidemi. | fallow deer in poland is an alien species, with an ambiguous legal status. it is considered both, a game and a farm animal, which introductions in recent years led to a substantial increase of its population. as a representative of cervids, it shares with other free-ranging and domestic ruminants many of gastrointestinal helminths, among them an alien ashworthius sidemi, the nematode of a high pathogenicity. until now, the parasite was observed in poland at two foci of the wild (i.e., bialowieza ... | 2012 | 23094333 |
| therapeutic efficacy of eprinomectin extended-release injection against induced infections of developing (fourth-stage larvae) and adult nematode parasites of cattle. | the therapeutic efficacy of eprinomectin in an extended-release injection (eri) formulation was evaluated against induced infections of developing fourth-stage larval or adult gastrointestinal and pulmonary nematodes of cattle in a series of six studies under two identical protocols (three each for developing fourth-stage larvae or adults) conducted in the usa, germany or the uk (two studies at each location, one per stage). each study initially included 16 nematode-free cattle. the cattle were ... | 2012 | 23273929 |
| nematode burdens of pastured cattle treated once at turnout with eprinomectin extended-release injection. | the efficacy of eprinomectin in an extended-release injection (eri) formulation was evaluated against infections with third-stage larvae or eggs of gastrointestinal and pulmonary nematodes in cattle under 120-day natural challenge conditions in a series of five studies conducted in the usa (three studies) and in europe (two studies). for each study, 30 nematode-free (four studies) or 30 cattle harboring naturally acquired nematode infections (one study) were included. the cattle were of various ... | 2012 | 23273928 |
| the efficacy of eprinomectin extended-release injection against naturally acquired nematode parasites of cattle, with special regard to inhibited fourth-stage ostertagia larvae. | the efficacy of eprinomectin in an extended-release injection (eri) formulation in the treatment of cattle harboring naturally acquired nematode populations (including inhibited nematodes) was evaluated. five studies were conducted under a similar protocol in the usa, the uk, and in germany. all study animals were infected by grazing naturally contaminated pastures. the adequacy of pasture infectivity was confirmed by examining tracer calves prior to allocation and treatment of the study animals ... | 2012 | 23273781 |
| an eprinomectin extended-release injection formulation providing nematode control in cattle for up to 150 days. | a series of 10 dose confirmation studies was conducted to evaluate the persistent activity of an extended-release injectable (eri) formulation of eprinomectin against single point challenge infections of gastrointestinal and pulmonary nematodes of cattle. the formulation, selected based on the optimal combination of high nematode efficacy, appropriate plasma profile, and satisfactory tissue residue levels, includes 5% poly(d,l-lactide-co-glycolic)acid (plga) and is designed to deliver eprinomect ... | 2012 | 23273777 |
| comparative efficacy of trichlorphon and trichlorphon/ivermectin combination treatment against anthelmintic-resistant cattle nematodes in argentina. | twenty-four holando argentino male calves were treated orally with 50 mg/kg body weight trichlorphon (tcf); 0.2 mg/kg body weight subcutaneous ivermectin (ivm); a combination of tcf+ivm at the same doses and administration routes; or remained untreated (control group). all calves were necropsied at day 14 post treatment for counting and identification of worms from abomasum, small and large intestines and lungs to determine the absolute efficacy (controlled efficacy test) for each treatment. usi ... | 2011 | 21739380 |
| evaluation of the persistent activity of moxidectin (10%) long-acting (la) injectable formulation against dictyocaulus viviparus, haemonchus placei, trichostrongylus axei and oesophagostomum radiatum infections in cattle. | two controlled studies were conducted to evaluate the persistent efficacy of moxidectin (10%) long-acting (la) injectable formulation against dictyocaulus viviparus, haemonchus placei, trichostrongylus axei and oesophagostomum radiatum in cattle. the moxidectin la injectable formulation was administered as a single subcutaneous injection into the proximal third of the ear at a dose rate of 0.01ml/kg bw to provide 1.0mg moxidectin/kg bw. the product had persistent efficacy of >90% against d. vivi ... | 2010 | 19896772 |
| moxidectin-resistant nematodes in cattle in brazil. | the frequent use of anthelmintics in cattle has contributed to the emergence of gastrointestinal nematode populations resistant to the drugs available in the market. this study aimed to evaluate moxidectin efficacy in a property with suspected presence of oesophagostomum spp. resistant to such anthelmintic. the accuracy of fecal egg count reduction test (fecrt) was also assessed through comparison with the data obtained in the controlled efficacy test (worm burden determination after necropsy). ... | 2009 | 19251366 |
| anthelmintic efficacy of oral trichlorfon solution against ivermectin resistant nematode strains in cattle. | infected calves from two different rural estates in brazil were studied to assess the anthelmintic efficacy of oral trichlorfon against naturally occurring ivermectin resistant parasitic nematode strains. in experiment i, infected animals were from a region where ivermectin resistant populations of haemoncus placei, cooperia punctata, cooperia spatulata and trichuris discolor have recently been identified. six calves with natural gastrointestinal nematode infections were treated with 48.5mg/kg a ... | 2009 | 19709817 |
| faecal egg output and herbage contamination with infective larvae of species of ostertagia and oesophagostomum from naturally infected farmed sika deer cervus nippon in lithuania. | faecal egg outputs and subsequent herbage larval contamination with third stage larvae (l3) of ostertagia spp. and oesophagostomum spp. from a herd of naturally infected sika deer cervus nippon were examined in the same pasture in 2001/2002 in lithuania. sika deer were infected with ostertagia circumcincta, o. kolchida, o. spiculoptera, oesophagostomum radiatum, o. columbianum and o. venulosum. faecal egg output in adult deer peaked in the spring during the periparturient period and also in late ... | 2007 | 17381872 |
| a 12-month survey of gastrointestinal helminth infections of cervids kept in two zoos in belgium. | infections with helminths are a major health issue in captive and wild deer. in this study, fecal egg count patterns and clinical signs associated with gastrointestinal nematodes were assessed for 12 mo in nine cervid herds kept under different husbandry conditions at two sites. at site 1, an urban zoo, fecal egg counts remained low and no clinical signs of parasitic gastroenteritis were seen in the herds of fallow deer (dama dama), dybowski's deer (cervus nippon dybowski), pudu (pudu pudu), and ... | 2005 | 17312767 |
| therapeutic and persistent efficacy of moxidectin 1% nonaqueous injectable formulation against natural and experimentally induced lung and gastrointestinal nematodes in cattle. | four controlled trials were conducted to evaluate the therapeutic and persistent efficacy of a new moxidectin formulation (moxidectin 1% nonaqueous injectable) against nematode parasites in cattle. this injectable moxidectin formulation, given as a single subcutaneous injection at a dose rate of 0.02 ml/kg bw to provide 0.2 mg moxidectin/kg bw, was highly efficacious (>90-100%) against larval and/or adult stages of many species of nematodes in cattle including, dictyocaulus viviparus, ostertagia ... | 2004 | 15063941 |
| epidemiology of gastrointestinal nematodes in cattle on traditional, small-scale dairy and large-scale dairy farms in iringa district, tanzania. | a longitudinal study was carried out to determine the prevalence, distribution and intensity of gastrointestinal (gi) nematodes in traditional, small-scale dairy and large-scale dairy cattle farms in iringa district, southern highlands of tanzania. coprological examination of cohorts for gi nematode eggs in faeces, tracer worm counts and pasture larval counts were performed monthly for 1 year. results indicated that the type of management, especially the grazing habit has a significant influence ... | 2004 | 15710529 |
| gastrointestinal nematodes in indigenous zebu cattle under pastoral and nomadic management systems in the lower plain of the southern highlands of tanzania. | this study aimed to determine the prevalence and intensity of gastrointestinal nematode infections in indigenous zebu cattle in the lower plain (lowland zone) of the southern highlands of tanzania. gastrointestinal tracts were randomly purchased at the iringa regional abattoir and at kihesa and ipogolo slaughter slabs in different seasons of the year. the contents of the abomasum, small intestine and large intestine were processed separately to recover the worms. the results indicated that 140 o ... | 2003 | 14509451 |
| dose confirmation of moxidectin 0.5% pour-on against adults and fourth-stage larvae of various cooperia spp. and trichostrongylus colubriformis in louisiana. | thirty-five castrate or intact holstein male calves, ranging in weight from 122 to 210kg, were used in the study. on study days -15 and -14, all study calves were treated with fenbendazole 10% paste at 10mg/kg to remove existing nematode infections. all cattle had zero egg counts on day -1. experimental infections of a mixed species inoculum were administered to all calves on day 0. the inoculum consisted of cooperia spp. (primarily c. punctata, but also c. pectinata, c. spatulata, c. oncophora ... | 2003 | 12809755 |
| dose confirmation studies of moxidectin 1% non-aqueous injectable and moxidectin 0.5% pour-on formulations against experimentally induced infections of larval and adult stage oesophagostomum radiatum and trichuris discolor in cattle. | separate controlled trials were conducted to evaluate the efficacy of two formulations of moxidectin (1% non-aqueous injectable solution and 0.5% pour-on (cydectin) against larval or adult stages of oesophagostomum radiatum and trichuris discolor infecting cattle. fifty-three strongylate-free dairy breed steer calves were obtained from commercial sources. after a brief acclimation period, calves were randomly divided into two pools to evaluate the efficacy of the moxidectin formulations against ... | 2002 | 12191901 |
| the epidemiology of gastrointestinal nematodes of dairy cattle in central kenya. | the epidemiology of h. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in kiambu district, central kenya during each of 13 one-month periods from april 1993 to april 1994. on each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. twelve of the animals were designated for bimonthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood an ... | 2001 | 11360797 |
| a multiplex pcr assay for differentiating economically important gastrointestinal nematodes of cattle. | a multiplex polymerase chain reaction (pcr) test was developed for identifying gastrointestinal (gi) nematodes that commonly infect cattle. this assay was developed using adult-derived genomic dna and shown capable of discriminating parasite eggs from the feces of experimentally-infected animals at both the species and genus levels. sequence data from internal (its) and external (ets) transcribed spacers of the ribosomal dna (rdna) repeats as well as the 3'-end of the small subunit rdna and 5'-e ... | 2001 | 11390072 |
| titration of subcutaneously administered eprinomectin against mature and immature nematodes in cattle. | eprinomectin has been approved for use as a topically applied endectocide for beef and dairy cattle. to determine if eprinomectin has utility as an injectable anthelmintic, it was titrated at 0.05, 0.1, and 0.2 mg/kg s.c. against adult (trial 1) and at 0.05, 0.1, 0.14, and 0.2 mg/kg s.c. against immature (trial 2) stages of lung and gastrointestinal nematodes in cattle. in trial 1, every dose of subcutaneously delivered eprinomectin showed maximal or near-maximal (> or = 99%) efficacy against ha ... | 2001 | 11780839 |
| the epidemiology of nematode and fluke infections in cattle in the red river delta in vietnam. | over a period of 13 months, faecal samples were collected monthly from approximately 45 cattle over 3 months of age. additionally, 74 calves of 1-2 months were sampled to determine the presence of toxocara vitulorum eggs. individual egg counts and infective strongyle larvae from pooled faecal samples were examined. post-mortem worm counts were carried out on six groups of tracer calves (n=12) that had been kept for 4 weeks on pasture in and around the village studied. the following helminths wer ... | 2000 | 11035232 |
| persistent efficacy of topical eprinomectin against nematode parasites in cattle. | six studies were conducted to evaluate the persistent efficacy of eprinomectin pour-on against experimental challenges with infective nematode larvae in calves. in each study, calves were randomly assigned to one untreated group and up to four test groups, which were treated with eprinomectin at 500 microg/kg body weight at weekly intervals before single bolus challenge. the calves were necropsied approximately 4 weeks after challenge infection for nematode recovery. eprinomectin pour-on provide ... | 2000 | 11097305 |
| efficacy of topically administered doramectin against eyeworms, lungworms, and gastrointestinal nematodes of cattle. | to evaluate efficacy of topically administered doramectin against eyeworms, lungworms, and gastrointestinal nematodes of cattle. | 1999 | 10376888 |
| persistent efficacy of doramectin pour-on against artificially induced infections of nematodes in cattle. | two studies were conducted to determine the persistent efficacy of doramectin pour-on against an artificial, trickle challenge of mixed nematodes in calves. in each study, 42, 4-8 months old calves were randomly assigned into four groups of 10 animals each (t1-t4), plus two larval-viability monitor animals. all animals were treated with fenbendazole (10 mg kg(-1)) 14 days prior to the start of the study to clear any existing infection. doramectin pour-on at 500 microg kg(-1) was used on each ani ... | 1999 | 10384905 |
| dose confirmation of moxidectin pour-on against natural nematode infections in lactating dairy cows. | the nematocidal effectiveness of moxidectin, administered topically at the rate of 500 mcg/kg bw, was determined for lactating dairy cows. naturally infected animals were given either topical vehicle or moxidectin (cydectin pour-on fort dodge animal health) at the rate of 1 ml/10 kg bw (10 animals per treatment group), and sacrificed 14-18 days post-treatment for nematode enumeration. 100% efficacies were recorded for ostertagia lyrata males, cooperia punctata males and oesophagostomum radiatum ... | 1999 | 10536978 |
| epidemiology of mecistocirrus digitatus and other gastrointestinal nematode infections in cattle in mindanao, philippines. | over a period of 14 months, faecal and serum samples were collected monthly from cattle of 1 to 30 months old on three ranches (20-25 animals ranch-1 sample-1) in mindanao, philippines. individual faecal egg counts, serum pepsinogen levels and mecistocirrus digitatus specific antibodies were determined, and infective larvae from pooled faecal samples were examined. post mortem worm counts were carried out on tracer calves (n = 16) that had been kept for 30 days with the herds on two of the ranch ... | 1998 | 9493308 |
| seasonal infection pattern of gastrointestinal nematodes of beef cattle in minas gerais state--brazil. | tracer calves were used to assess the seasonality of infections of gastrointestinal parasites in beef cattle extensively raised at a farm in the state of minas gerais, brazil. tracer calves acquired infections during all months of the year, however, highest worm burdens were observed in the rainy season. the following nematode species were recovered from tracer calves: cooperia punctata, c. spatulata, c. pectinata, haemonchus similis, h. placei, oesophagostomum radiatum, trichostrongylus colubri ... | 1998 | 9561708 |
| demonstration of shared carbohydrate epitopes in intestinal proteins of some bovine gastrointestinal nematodes. | the presence of shared carbohydrate intestinal epitopes in bovine gastrointestinal nematodes was demonstrated. proteins were extracted from the intestinal tissue of a laboratory strain of adult haemonchus placei and used to produce monoclonal antibodies (mab). analysis of this detergent extract by sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed 7-9 bands ranging from approximately 39 to 298 kda. the mabs reacted with periodate-sensitive epitopes and, in western blots, recogniz ... | 1998 | 9645850 |
| quantitative characterization of texture used for identification of eggs of bovine parasitic nematodes. | this study investigates the use of texture, i.e. the grey level variation in digital images, as a basis for identification of strongylid eggs. texture features were defined by algorithms applied to digital images of eggs from the bovine parasitic nematodes, ostertagia ostertagi, cooperia oncophora, and oesophagostomum radiatum. the resulting data served to establish classification criteria by linear discrimination analysis, and the criteria were subsequently evaluated by cross-validations. from ... | 1998 | 9687600 |
| identification and semi-quantitation of ostertagia ostertagi eggs by enzymatic amplification of its-1 sequences. | a region within the first internal transcribed spacer (its-1) of the ribosomal dna repeat of ostertagia ostertagi has been identified that is 408 base pairs (bp) in length and is comprised of a 2 x 204 bp repeat. universal polymerase chain reaction (pcr) primers which span this region, as well as a portion of the 5.8s rdna, generate a 1011 bp fragment using genomic dna from o. ostertagi. however, these same primers generate only a 600 bp (approximate) fragment using dna from haemonchus contortus ... | 1998 | 9763315 |
| an abattoir survey of gastrointestinal nematode infections in cattle in the central highlands of kenya. | the gastrointestinal tracts of 672 crossbred cattle were obtained from various abattoirs in kiambu district, kenya from august 1992 to july 1993, and examined for the presence of gastrointestinal nematodes. eight nematode species were found in 583 (86.8%) of the animals. the nematodes were, in order of prevalence: haemonchus placei (67.0%), cooperia pectinata (53.0%), cooperia punctata (41.7%), oesophagostomum radiatum (38.4%), trichostronglyus axei (24.3%), nematodirus helvetianus (19.6%), tric ... | 1998 | 9778778 |
| systematic relationships of some members of the genera oesophagostomum and chabertia (nematoda: chabertiidae) based on ribosomal dna sequence data. | the present study characterised seven species of the chabertiidae (nematoda: strongyloidea) belonging to either the subfamily oesophagostominae (oesophagostomum radiatum, oesophagostomum venulosum, oesophagostomum dentatum, oesophagostomum quadrispinulatum, oesophagostomum columbianum, oesophagostomum bifurcum) or to the subfamily chabertiinae (chabertia ovina) by their second internal transcribed spacer rdna sequence, assessed the extent of intraspecific variation and interspecific differences ... | 1998 | 9846616 |
| efficacy of doramectin for treatment of experimentally induced infection with gastrointestinal nematodes in calves. | to determine the efficacy of injectable doramectin against experimentally induced infections with adult and larval (l4) stages of gastrointestinal nematodes in calves. | 1997 | 9055975 |
| evaluation of the persistence of the effect of ivermectin and abamectin against gastrointestinal and pulmonary nematodes in cattle. | the persistence of the effect of ivermectin and abamectin against gastrointestinal nematodes and lungworm in cattle was evaluated in two trials, each involving 28 animals. groups of seven cattle either remained untreated, or were treated topically with ivermectin at 500 micrograms/kg bodyweight or subcutaneously with either ivermectin or abamectin at 200 micrograms/kg bodyweight. starting on the day of treatment the cattle were given daily trickle infections with various infective nematode larva ... | 1997 | 9090034 |
| efficacy of a pour-on formulation of eprinomectin (mk-397) against nematode parasites of cattle, with emphasis on inhibited early fourth-stage larvae of ostertagia spp. | to evaluate efficacy of topically applied eprinomectin against inhibited early fourth-stage larvae (il4) of ostertagia spp in calves. | 1997 | 9099383 |
| nematocidal efficacy of eprinomectin, delivered topically, in naturally infected cattle. | to assess the nematocidal efficacy of eprinomectin in naturally infected cattle. | 1997 | 9185967 |
| effect of simulated rain, coat length and exposure to natural climatic conditions on the efficacy of a topical formulation of eprinomectin against endoparasites of cattle. | a series of five controlled studies involving 114 cattle were conducted in australia, north america and the united kingdom to examine the effect of simulated rain, coat length and exposure to natural climatic conditions, on the efficacy of a topical formulation of eprinomectin against nematode parasites of cattle. in all trials infections were induced with a range of bovine nematode species and treatment was applied when the majority of nematodes were mature. in one study, simulated rain was app ... | 1997 | 9187034 |
| therapeutic and prophylactic efficacy of the ivomec sr bolus against nematodes and psoroptes ovis in cattle weighing more than 300 kg at the time of treatment. | three trials using 50 european breed cattle were conducted to evaluate the therapeutic and prophylactic efficacy of the ivomec sr bolus against nematodes (2 trials) and psoroptes ovis (1 trial) in cattle weighing more than 300 kg at the time of treatment. the ivomec sr bolus proved to be highly effective against economically important gastrointestinal and pulmonary nematodes (ostertagia ostertagi, trichostrongylus axei, cooperia punctata, oesophagostomum radiatum, dictyocaulus viviparus) and imp ... | 1997 | 9272566 |
| cryopreservation of sheathed third-stage larvae of oesophagostomum radiatum (nodular worm of cattle). | sheathed infective larvae of oesophagostomum radiatum were successfully cryopreserved by the use of a procedure developed for hookworms. the survival rate, as assessed by motility, was 57.9% after 42 d of cryopreservation. | 1997 | 9352566 |
| effects of gastrointestinal nematode infection on the ruminant immune system. | gastrointestinal (gi) nematodes of ruminants evoke a wide variety of immune responses in their hosts. in terms of specific immune responses directed against parasite antigens, the resulting immune responses may vary from those that give strong protection from reinfection after a relatively light exposure (e.g. oesophagostomum radiatum) to responses that are very weak and delayed in their onset (e.g. ostertagia ostertagi). the nature of these protective immune responses has been covered in anothe ... | 1997 | 9460205 |
| the efficacy of eprinomectin against induced infections of immature (fourth larval stage) and adult nematode parasites in cattle. | eprinomectin is a new endectocide of the avermectin chemical group developed for use in cattle. to establish its effectiveness against cooperia spp., dictyocaulus viviparus, haemonchus contortus, nematodirus helvetianus, oesophagostomum radiatum, ostertagia ostertagi, trichostrongylus axei and trichostrongylus colubriformis (immature infections only), six trials were conducted in europe at two trial sites. in each trial, animals were artificially infected with a number of nematode species and tr ... | 1997 | 9477498 |
| efficacy of moxidectin pour-on against gastrointestinal nematodes and dictyocaulus viviparus in cattle. | twenty crossbred beef heifer calves were used for an efficacy evaluation of 0.5% moxidectin pour-on against gastrointestinal nematodes and dictyocaulus viviparus. the latter parasite and bunostomum phlebotomum were the target species. the calves were exposed to natural infection on pasture from late september to december 22. additionally, all calves were experimentally infected with b. phlebotomum at 71 and 29 days before treatment and with d. viviparus at 29 days before treatment. the 20 calves ... | 1996 | 8893482 |
| efficacy of moxidectin 0.5% pour-on against naturally acquired nematode infections in cattle. | the efficacy of 0.5% moxidectin pour-on at two dosages was evaluated in 30 cattle with naturally acquired gastrointestinal nematode infections. the cattle were ranked according to pretreatment fecal egg counts and body weights, and were randomly assigned from replicates to three treatment groups. the mean number of trichostrongyle eggs in pretreatment fecal samples did not differ among the groups. groups i and ii received 0.5% moxidectin pour-on at dosages of 0.25 mg moxidectin per kg body weigh ... | 1996 | 8916402 |
| digital image analysis and identification of eggs from bovine parasitic nematodes. | computer-assisted microscopy and multivariate statistics were used to establish and evaluate a procedure for identification of bovine strongylid eggs. ostertagia ostertagi, cooperia oncophora, haemonchus placei, trichostrongylus axei, and oesophagostomum radiatum eggs were obtained from faeces voided by monospecifically infected calves. images of single eggs (400 x magnification) were recorded by a ccd camera fitted onto a microscope and digitized on a pc. after separation of eggs from the image ... | 1996 | 8960211 |
| the epidemiology of gastrointestinal nematode infections in communal cattle and commercial beef cattle on the highveld of zimbabwe. | an epidemiological study of gastrointestinal nematode infections of cattle was conducted on the highveld of zimbabwe from june 1993 to may 1995. the study was carried out in two communal areas, two conventional beef farms and two commercial beef farms with irrigated pastures. on all farms/areas, faecal egg counts were low (< 500 eggs per g faeces) during the dry season. during the rainy season faecal egg counts were highest in communal areas and lowest in conventional beef farms. those of irriga ... | 1996 | 9011020 |
| monthly fluctuations of worm burdens and hypobiosis of gastrointestinal nematodes of calves in extensive management systems in the pyrenees (spain). | monthly fluctuations of worm burdens and arrested development of gastrointestinal nematodes in cattle from a mountainous region of spain were studied. fourteen previously helminth-naive calves grazed together with a herd of 120 cattle from may to november following the traditional extensive grazing system used in mountainous regions of spain (permanent calves). each month, throughout the grazing season, two helminth-naive calves (tracer calves) were added to the herd and allowed to graze for 4 w ... | 1996 | 9017870 |
| eprinomectin: a novel avermectin for use as a topical endectocide for cattle. | eprinomectin (mk-397 or 4"-epi-acetylamino-4"-deoxy-avermectin b1) is a novel avermectin selected for development as a topical endectocide for all cattle, including lactating dairy cows. herein, we show its anthelmintic, insecticidal and miticidal activity. to determine its anthelmintic capabilities, eprinomectin was tested topically on jersey calves at 0.08, 0.2, or 0.5 mg kg-1 in a probe formulation against experimental infections of adult haemonchus placei, ostertagia ostertagi, trichostrongy ... | 1996 | 9024867 |
| persistent anthelmintic activity of ivermectin against gastrointestinal nematodes of cattle. | two experiments were conducted to determine persistence of ivermectin (ivm) anthelmintic activity. in the first experiment, the injectable (inj) formulation at a dosage of 200 micrograms/kg of body weight and pour-on (po) formulation at a dosage of 500 micrograms/kg were compared in 5 groups of calves (n = 6/group). calves were treated at 14 and 7 days prior to experimentally induced infection. experimental groups were: 1--untreated, infected controls; 2--ivm po, day -14; 3--ivm po, day -7; 4--i ... | 1995 | 7486394 |
| effect of a single dry season anthelmintic treatment of n'dama cattle on communal pastures in the gambia. | the effect of a single anthelmintic treatment of cattle during the early dry season was studied. one hundred and sixty-six n'dama cattle, 1-3 years old, were selected from five herds. there were 65 males and 101 females divided into two groups of 83 animals each. one group was treated with fenbendazole at 7.5 mg/kg body weight by mouth in november 1992; the other group remained as the untreated control. at monthly intervals from november 1992 to april 1993, each animal was weighed and the number ... | 1995 | 7571394 |
| helminth parasites and hypobiosis of nematodes in n'dama cattle during the dry season in the gambia. | three series of necropsies of cattle were performed, corresponding to early dry season, approximately 1 month after the last rains (november, n = 6), mid dry season (february, n = 6) and end dry season (april, n = 3). eggs per gram of faeces (epg) were determined just before necropsy. three trematodes (fasciola gigantica, schistosoma spp. and paramphistomatids) and 11 nematodes were identified from cattle, with the prevalence rate varying from 6.7% to 100%. haemonchus contortus was the most abun ... | 1995 | 8644452 |
| an association between successful vaccination against the bovine nodular worm, oesophagostomum radiatum and induction of eosinophilia. | immunization of 48 cattle with somatic antigen extracts of the nodular worm, oesophagostomum radiatum, reduced faecal egg counts (fec) by 51% and worm burden by 47%. the antibody titre of each animal was correlated to both worm burden (r = -0.40, p < 0.005) and fec (r = -0.37, p < 0.01). the vaccinated cattle showed wide variation in their response to vaccination with worm burdens after challenge infection varying from 0 to 4060. of these 48 vaccinated animals, eight developed sterile immunity ( ... | 1994 | 7806267 |
| antigenic analysis of dictyocaulus viviparus by use of test-positive bovine sera. | an antigen extract of dictyocaulus viviparus was analyzed by use of sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and the antigen-recognition patterns of serum antibody from cattle not infected, cattle infected with d viviparus, and cattle with unknown history of d viviparus were analyzed by the use of elisa and western blotting techniques. cross-reactive antibody-recognition patterns were determined by comparing western blots of d viviparus-positive sera with blots of d viviparus-n ... | 1994 | 7998700 |
| ostertagia, haemonchus, cooperia, and oesophagostomum: construction and characterization of genus-specific dna probes to differentiate important parasites of cattle. | partial genomic dna libraries for four common cattle parasites, ostertagia ostertagi (oo), haemonchus placei (hp), cooperia oncophora (co), and oesophagostomum radiatum (or), were generated and differentially screened with radiolabeled homologous and heterologous genomic dna. clones were identified from each parasite species which did not cross react with dna from the heterologous genera by southern blot or slot-blot analyses. four clones, poo2, php2.1, pco2, and por14 were chosen for further ex ... | 1994 | 8299764 |
| efficacy of abamectin against nematodes in cattle. | eight controlled trials were conducted, using 96 cattle of european breeds, to evaluate the efficacy of abamectin against natural and artificially acquired infections of adult and fourth-stage larvae of all the economically important gastrointestinal nematodes and lungworms in germany and the united kingdom. half the animals were treated on one occasion with abamectin at a dose of 200 micrograms/kg bodyweight given subcutaneously while the other half remained untreated. worms were counted 14 or ... | 1993 | 8442334 |
| influence of host genetics upon antibody responses against gastrointestinal nematode infections in cattle. | previous studies have shown that the number of gastrointestinal nematode eggs released per gram of feces (epg) of calves is strongly influenced by host genetics. the purpose of this study was to determine if host genetics also influenced immune recognition of parasite antigens in these same calves. serum samples were taken at monthly intervals from calves during their first grazing season, from approximately 4 months after the onset of calving and were continued until weaning. serum samples were ... | 1993 | 8484226 |
| activity of doramectin against nematode endoparasites of cattle. | a series of 28 controlled anthelmintic studies, involving 634 cattle, was conducted throughout north america and europe to evaluate the efficacy of doramectin against a broad range of gastrointestinal parasitic nematode species and lungworms in naturally and experimentally infected animals. within each study, one or two groups were treated with doramectin at 200 micrograms kg-1 and another group received no drug treatment. worm burdens were estimated by standardised techniques, and efficacy asse ... | 1993 | 8236735 |
| efficacy of doramectin against field nematode infections of cattle in latin america. | two studies were conducted, one in argentina and one in brazil, to evaluate the therapeutic efficacy of doramectin administered subcutaneously at a dose rate of 200 micrograms kg-1 (1 ml per 50 kg) to cattle harboring mixed field infections of gastrointestinal nematodes. in each trial, 20 heifers were randomly allocated to a control or treated group of ten animals each, on the basis of fecal egg counts. animals in the treated and control groups received an injection of doramectin or saline in th ... | 1993 | 8236736 |
| oesophagostomum radiatum: the effect of different adjuvants on vaccination with a partially purified protective antigen. | the components of a soluble extract of adult oesophagostomum radiatum were separated into four fractions by gel filtration chromatography on a superose-12 column. the second fraction had a molecular weight range of approximately 60,000-65,000 as judged by sds gel electrophoresis. vaccination of calves with this fraction significantly (p < 0.05) reduced faecal egg output after challenge infection. in addition, the packed cell volume of vaccinated calves was higher than that of control calves (p < ... | 1993 | 8249243 |
| persistent anthelmintic activity of abamectin injection in cattle. | the duration of the anthelmintic activity of abamectin administered by subcutaneous injection at 200 microg/kg was determined using induced infections of haemonchus placei, ostertagia ostertagi, cooperia spp., and oesophagostomum radiatum in cattle. twenty-four friesian calves, raised under worm-free conditions, were assigned to four groups of six animals using a randomised block design based on bodyweight. one group acted as untreated controls and the other three were treated with abamectin 14, ... | 1992 | 16031652 |
| anthelmintic activity of paraherquamide in calves. | paraherquamide, an oxindole alkaloid metabolite of penicillium paraherquei and penicillium charlesii, was tested against the adult stages of nine common gastrointestinal and lung nematodes of calves at single, oral dosages of 0.5, 1.0, 2.0 or 4.0 mg kg-1. at dosages 1.0-4.0 mg kg-1 there was 95% or more removal of haemonchus placei, ostertagia ostertagi, trichostrongylus axei, trichostrongylus colubriformis, cooperia oncophora, nematodirus helvetianus, oesophagostomum radiatum, and dictyocaulus ... | 1992 | 1413457 |
| efficacy of cydectin moxidectin 1% injectable against experimental infections of dictyocaulus viviparus and bunostomum phlebotomum superimposed on natural gastrointestinal infections in calves. | twenty male holstein calves averaging 105 kg in weight and naturally infected with gastrointestinal nematodes and small numbers of lungworm and hookworm, were given experimental infections with the two latter species to provide adult and larval stages for anthelmintic evaluation. following random allotment, one group of 10 calves was injected subcutaneously with moxidectin at a dosage of 0.2 mg kg-1 of body weight. a second group of 10 was injected subcutaneously with unmedicated blank vehicle a ... | 1992 | 1413460 |
| efficacy of moxidectin against gastrointestinal nematodes of cattle. | three groups of 11 naturally infected crossbred beef calves were injected subcutaneously with moxidectin 1 per cent injectable at 0.2 or 0.3 mg moxidectin/kg bodyweight or with the unmedicated vehicle. nematode infections had been acquired during grazing from december to april. based on the faecal egg counts and total worm counts of the control calves at necropsy (11 to 13 days after treatment) most of the calves had heavy parasitic burdens. ostertagia ostertagi was predominant and the mean numb ... | 1992 | 1441146 |
| efficacy of moxidectin against naturally acquired nematode infections in cattle. | the efficacy of moxidectin, a new endectocide against natural nematode infections, was evaluated. twenty-five calves were divided into two groups of eight calves each and a third group of nine calves. moxidectin was administered s.c. to two groups (i, 0.2 mg kg-1 body weight (bw); ii, 0.3 mg kg-1 bw) and the third group (iii) received the vehicle (placebo) s.c. two pre-treatment and one post-treatment faecal nematode egg count determinations were made from all calves, and they were necropsied 2 ... | 1992 | 1502785 |
| efficacy of ivermectin delivered from a sustained-release bolus against inhibited early fourth-stage larvae of ostertagia ostertagi and other nematodes in cattle. | the anthelmintic efficacy of ivermectin (ivm) delivered from a sustained-release (sr) bolus was evaluated against natural infections with gastrointestinal tract nematodes in 12 crossbred beef heifers in spring. the 12 calves were randomly allotted to 2 groups of 6 calves each. group-1 calves were treated with an sr bolus designed to deliver 8 mg of ivermectin/d. group-2 calves were nontreated controls. cattle groups were kept in separate concrete-floored pens (grass hay nutrition) and slaughter ... | 1992 | 1524310 |
| efficacy of abamectin against natural infections of gastrointestinal nematodes and lungworm of cattle with special emphasis on inhibited, early fourth stage larvae of ostertagia ostertagi. | the anthelmintic efficacy of abamectin (avermectin b1) was evaluated against gastrointestinal nematodes, including ostertagia ostertagi inhibited larvae and lungworm, in yearling crossbred beef heifers during late spring. the calves were grazed on contaminated pasture for 10 weeks and then held under conditions free of nematode infection for 3 weeks prior to allotment and treatment on 5 june. thirteen calves were randomly assigned to two groups of six by restricted randomization on body weights; ... | 1992 | 1532875 |
| effects of low levels of lice and internal nematodes on weight gain and blood parameters in calves in central texas. | the effects of low levels of both biting and sucking lice, a mixed population of nematodes, and a combination of all these parasites were evaluated in calves held in a barn with no environmental controls in central texas. observations at 122 sites on each animal for 16 wk consecutively in 1987 revealed that the largest numbers of all louse species [haematopinus eurysternus (nitzsch). linognathus vituli (l.), and bovicola bovis (l.)] occurred 3-7 wk after infestation. in 1988 l. vituli population ... | 1992 | 1607476 |
| the seasonal epidemiology of gastrointestinal nematodes in n'dama cattle in the gambia. | from june 1987 to june 1988, a total of 180 n'dama cattle were necropsied to identify and enumerate parasites present, including 39 sick calves and 25 dead calves from local village herds, and 116 adult cattle from a local abattoir. of 175 animals infected with one or more helminths (97%), haemonchus contortus was found in 67% of all necropsied animals, cooperia punctata in 75%, cooperia pectinata in 55%, oesophagostomum radiatum in 71% and bunostomum phlebotomum in 21%. there was a wide range o ... | 1990 | 2238429 |
| [large-intestinal nematoda in bison]. | in the białowieza forest the parasitological autopsy of large intestine of 6 bisons was made at the beginning of winter of 1987-1988, and 9 dissections were made in the latter part of both seasons. four species of nematodes were found to occur together: chabertia ovina, oesophagostomum radiatum, oe. venulosum and trichocephalus ovis. at the end of wintering in bisons the invasion of ch. ovina appeared in high percent of animals, but the intensity of it was low. however, the extensity and intensi ... | 1990 | 2256336 |
| genetic control of immunity to gastrointestinal nematodes of cattle. | previous studies have indicated that host genetics significantly affects the number of gastrointestinal nematode eggs per gram (epg) in the feces of calves during their first grazing season. an entire calf crop of approximately 190 animals was monitored monthly until weaning to verify these earlier results, and to begin to discern the basis for this phenomenon. a significant genetic effect on fecal epg values was not observed until calves had been on pasture for 2-3 months, and was demonstrable ... | 1990 | 2267727 |
| the relationships among ecto- and endoparasite levels, class i antigens of the bovine major histocompatibility system, immunoglobulin e levels and weight gain. | natural infestations of the cattle tick boophilus microplus, levels of the buffalo fly haematobia irritants exigua and faecal nematode egg concentrations (bunostomum phlebotomum, cooperia spp., haemonchus placei, oesophagostomum radiatum and trichostrongylus axei) were assessed in 221 belmont red calves during the post-weaning period, when the animals were between 9 and 18 months of age. in addition, the 98 males of this group were challenged with b. microplus larvae on two separate occasions. t ... | 1990 | 2316176 |
| oesophagostomum radiatum: inhibition of in vitro development by newborn calf serum. | oesophagostomum radiatum developed to fourth stage larvae after 14 days in vitro culture. however, development was totally inhibited if the standard 50% foetal calf serum in the medium was replaced by newborn calf serum. inhibition did not occur with serum from cattle immune to o. radiatum through natural infection or experimental vaccination irrespective of the titre of specific antibodies to o. radiatum in each serum. the inhibitory action of ncs could be abolished by heat treatment at 56 degr ... | 1990 | 2338487 |
| cryopreservation of some common nematodes of ruminants for up to 11,3 years. | infective larvae of selected batched of the following nematode species from sheep and cattle were examined for survival and infectivity (by injection into either the abomasum, the duodenum, or the jugular vein) after having been stored in liquid nitrogen for 103-136 months: haemonchus contortus, haemonchus placei, ostertagia circumcincta, ostertagia ostertagi, marshallagia marshalli, cooperia spp., trichostrongylus axei, trichostrongylus colubriformis, trichostrongylus falculatus, nematodirus sp ... | 1990 | 2338992 |
| efficacy of a topical formulation of ivermectin against naturally acquired gastro-intestinal nematodes in weaner cattle. | the efficacy of a topical formulation of ivermectin against naturally acquired gastro-intestinal nematodes in weaner cattle was evaluated. at slaughter, 14-15 days after treatment, burdens of ostertagia spp, trichostrongylus axei and oesophagostomum radiatum were significantly lower in the treated calves than in the untreated controls (p<0.01). efficacies (based on geometric mean worm burdens of treated and control groups) were 99.6%, 95.1% and 100% respectively. the sizes of the cooperia spp an ... | 1990 | 16031564 |
| induction of protective immunity in calves immunized with adult oesophagostomum radiatum somatic antigens. | oesophagostomum radiatum, the nodular worm of cattle, is a severe pathogen in previously uninfected calves. however, cattle develop a strong protective immune response upon exposure to the parasite. in order to evaluate whether soluble parasite antigens could induce protective immunity, a soluble fraction was obtained from disrupted adult worms, and this fraction was used to vaccinate calves. the vaccination protocol involved two immunizations. the first was administered intramuscularly with com ... | 1989 | 2617827 |
| efficacy of oxfendazole against inhibited larvae of ostertagia ostertagi in naturally infected calves in the southern usa. | forty yearling calves were assigned to four equal groups; three of the groups were treated with oxfendazole at dose rates of 6.75 mg/kg, 4.50 mg/kg, or 2.25 mg/kg bodyweight while the fourth group served as an untreated control. the calves were native to north-east mississippi, usa, and harboured natural infections of gastrointestinal nematodes. the study was conducted during july when inhibited early fourth-stage larvae may be found in large numbers after their acquisition in the spring. the ca ... | 1989 | 2728298 |
| factors affecting the survival and migration of the free-living stages of gastrointestinal nematode parasites of cattle in central queensland. | faecal pats containing parasitic nematode eggs were deposited monthly on worm-free pasture, from mid-1975 to early in 1979, near rockhampton in central queensland. pasture samples were collected monthly from beside these pats and the number of infective larvae on the samples was counted. cooperia spp. were the most numerous larvae on pasture all year round and haemonchus placei were commonly present in low numbers. small numbers of oesophagostomum radiatum larvae were found, mostly during summer ... | 1989 | 2728322 |
| the relation between the natural worm burden of steers and the faecal egg count differentiated to species. | the relation between the faecal egg count and the worm burden was investigated in 104 steers of three breeds, 9-24 months of age, which were subjected to natural infection with nematode larvae from pasture at the national cattle breeding station near rockhampton in central queensland. the worm species found were cooperia spp., haemonchus placei, trichostrongylus axei, oesophagostomum radiatum and small numbers of bunostumum phlebotumum. the faecal egg count was found to be a reliable measure of ... | 1989 | 2728323 |
| oesophagostomum radiatum: successful vaccination of calves with high molecular weight antigens. | extracts of adult oesophagostomum radiatum were resolved into four fractions by gel filtration chromatography on a superose 12 column. elisa assays on these four fractions showed that the antibodies produced by naturally infected calves predominantly reacted with the void volume fraction (vv). three trials were conducted in which calves were vaccinated with the vv fraction of adult extract. when compared to untreated controls, vaccination with the vv of adult extract significantly (p less than 0 ... | 1989 | 2759767 |
| controlled dosage titration of febantel paste in naturally parasitized cattle. | a controlled anthelmintic trial was conducted to determine the efficacy of febantel paste (45.5%) at dosages of 2.5, 5.0, 7.5, and 10.0 mg/kg in calves harboring natural gastrointestinal nematode infections. dosages of 5.0, 7.5 and 10.0 mg of febantel/kg of body weight were greater than 96% effective in removing adults of haemonchus contortus, ostertagia spp, cooperia spp, and oesophagostomum radiatum. the 2.5 mg/kg dosage was considered suboptimal because of low efficacy against ostertagia and ... | 1989 | 2802334 |
| prophylactic efficacy of an ivermectin sustained-release bolus against challenge exposure with gastrointestinal and pulmonary nematode infective larvae in calves. | twelve holstein calves were used to determine the prophylactic efficacy of ivermectin against challenge exposure with gastrointestinal and pulmonary nematodes. two groups of 6 calves (mean body weight, 205 kg) each were formed by restricted randomization according to body weight. group-1 calves served as nonmedicated controls. each calf of group 2 was orally given one prototype sustained-release bolus designed to deliver ivermectin at a continuous daily dose of 8 mg. third-stage nematode infecti ... | 1988 | 3189987 |
| abundance and survival of infective larvae of the cattle nematodes cooperia punctata, haemonchus placei and oesophagostomum radiatum from faecal pats in a wet tropical climate. | observations were made on the abundance and survival of haemonchus placei, cooperia punctata and oesophagostomum radiatum infective larvae from cattle faecal pats exposed at various times of the year in north queensland wet tropics. pats exposed in the hot, wet season yielded abundant larvae on herbage. in the dry season, although low numbers of infective larvae were usual, considerable numbers were produced under conditions of heavy dews on dense herbage. irrespective of season of deposition of ... | 1988 | 3190586 |
| a comparison of worm burden and faecal egg count for measuring the efficacy of vaccination against oesophagostomum radiatum. | 1988 | 3192358 | |
| prophylactic efficacy of sustained-release ivermectin against induced nematode infestations in cattle. | the efficacy of sustained-release ivermectin was evaluated against challenge infestations of gastro-intestinal nematodes in a laboratory study involving 12 treated and 12 untreated control cattle. a weighted, orally administered osmotically activated device designed to lodge in the rumeno-reticulum and to deliver ivermectin at a dosage rate of approximately 8 mg/day for a 120-day period, was administered to treated cattle. animals were challenged with infective larvae of bunostomum phlebotomum a ... | 1988 | 3361567 |
| oesophagostomum radiatum: successful vaccination of calves with an extract of in vitro cultured larvae. | 1988 | 3366530 | |
| differential recoveries from faecal cultures of larvae of some gastro-intestinal nematodes of cattle. | faecal cultures were established using bovine faeces containing known numbers of eggs from either oesophagostomum radiatum, haemonchus placei, cooperia pectinata or a mixture of all three. a substantially greater percentage of larvae was recovered from cultures of o. radiatum and c. pectinata than was recovered from cultures of h. placei. the same pattern was observed in mixed cultures although yields of larvae from all species in mixed cultures were significantly reduced (p less than 0.001). th ... | 1988 | 3397511 |
| efficacy of oxfendazole against inhibited larvae of ostertagia ostertagi acquired by calves in the spring. | during the spring of 1985, 40 calves grazed pastures known to have high numbers of spring inhibition-prone, infective ostertagia ostertagi larvae. calves were removed from pasture and placed in outdoor pens with concrete floors from 10 days prior to treatment until necropsy 14 days after treatment. ten calves were allocated to each of 4 treatment groups, and oxfendazole was administered to each group by intraruminal injection at dosages of 0, 2.25, 4.5, and 6.75 mg/kg of body weight. efficacies ... | 1988 | 3421523 |
| anthelmintic efficacy of netobimin against naturally acquired gastrointestinal nematodes in yearling heifers. | the efficacy of netobimin (coded sch 32481, schering corporation) in removing naturally acquired gastrointestinal nematode infections was evaluated in 10 treated and 10 untreated (control) yearling beef heifers. the anthelmintic was administered as an oral drench at a dose level of 7.5 mg kg-1 body weight. fecal egg per gram (epg) counts were reduced with netobimin by 98% (p less than or equal to 0.01) at both 1 and 2 weeks post-treatment (pt). the compound was highly effective in removing oesop ... | 1987 | 3439007 |
| protection from parasite-induced weight loss by the vaccination of calves with excretory-secretory products of larval oesophagostomum radiatum. | excretory-secretory products (esp) were collected from in vitro maintained oesophagostomum radiatum larvae during the period in which the larvae molt from the third to fourth larval stage. the esp were used to immunize 13 uninfected calves which were subsequently challenged with 1.7 x 10(4) infective o. radiatum larvae. worm recoveries from immunized calves were reduced 23% compared to 12 unimmunized controls, while the number of intestinal nodules was 72% greater compared to unimmunized control ... | 1987 | 3439009 |
| helminth parasites of beef cattle in the cerrado region of brazil. | the results are presented of a ten-year research programme on the helminth parasites of beef cattle raised in the extensive cerrado region of central-east brazil. the most important helminths are cooperia spp., haemonchus spp. (80% h. similis), trichostrongylus spp. and oesophagostomum radiatum. both production and infection are dominated by the alternation of rainy and dry seasons. attempts to develop and implement control measures and their limitations are discussed. | 1987 | 3603712 |
| efficacy of fenbendazole-medicated feed blocks against gastrointestinal nematode infections in calves. | an anthelmintic trial was conducted to determine the efficacy of fenbendazole (fbz) incorporated into two types of feed blocks given daily for 3 or 10 days to calves naturally parasitized with gastrointestinal nematodes. each treated calf consumed 5 mg of fbz/kg of body weight. the fbz was greater than 99% effective in removing adults of haemonchus contortus, ostertagia ostertagi, o lyrata, cooperia punctata, c pectinata, c onchophora, trichostrongylus axei, bunostomum phlebotomum, and oesophago ... | 1987 | 3605803 |