| occurrence and seasonal behavior of gastrointestinal nematodes infecting maine dairy cattle. | gastrointestinal tracts of 48 yearling maine dairy cattle were examined (8 animals every 2 months) for 1 year. adult and immature nematodes were identified and counted. species recovered were bunostomum phlebotomum, cooperia mcmasteri, cooperia oncophora, cooperia pectinata, cooperia punctata, haemonchus placei, nematodirus helvetianus, oesophagostomum radiatum, ostertagia circumcincta, ostertagia lyrata, ostertagia ostertagi, trichostongylus axei, and trichuris ovis. strongyle parasitism was ob ... | 1977 | 145192 |
| [distribution of nematode parasites of the digestive system in sheep (ovis aries) and goats (capra hircus) of the piedmontese and valdostano alpine arc]. | a survey, carried out on gastro-intestinal nematodes of sheep and goats of piemonte and of valle d'aosta (87 sheep and 12 goats) has shown the presence of the following species in sheep, bunostomum trigonocephalum, chabertia ovina, cooperia curticei, haemonchus contortus, marshallagia marshalli, nematodirus abnormalis, nematodirus filicollis, nematodirus helvetianus, nematodirus spathiger, oesophagostomum venulosum, ostertagia circumcincta, ostertagia lyrata, ostertagia trifurcata, skrjabinema o ... | 1977 | 572958 |
| 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 |
| interbreeding in the subfamily ostertagiinae (nematoda: trichostrongylidae) of ruminants. | the interbreeding of 6 species of ostertagiines was studied in a sheep model. virgin young females of selected nonpolymorphic strains of ostertagia ostertagi, ostertagia leptospicularis, and teladorsagia circumcincta were mated with various male ostertagiines. interbreeding was successful between o. ostertagi and ostertagia lyrata, o. leptospicularis and ostertagia kolchida, and t. circumcincta and teladorsagia trifurcata, respectively. their offspring were fertile and resembled one parent or th ... | 1992 | 1597780 |
| efficacy of febantel against abomasal nematodes and lungworms in cattle. | the efficacy of febantel at a dosage of 5 mg/kg (45.5% paste formulation) against inhibited early 4th-stage larvae (el4) of ostertagia ostertagi, other nematodes of the abomasum, and dictyocaulus viviparus was investigated in 4- to 6-month-old holstein calves that grazed on pasture heavily contaminated with parasites from february 24 to april 1, 1986 (36 days). in louisiana, this is the first month of a 3-month period in which increasing numbers of inhibition-prone o ostertagi larvae are acquire ... | 1988 | 2977070 |
| 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 |
| species and morphs in the ostertagiinae: an allozyme study of seven species. | five enzymes, malate dehydrogenase, lactate dehydrogenase, mannose-phosphate isomerase, glucose-phosphate isomerase and phosphoglucomutase from seven putative species of ostertagiinae were compared using starch-gel electrophoresis. the nei distances were not much affected by origin of specimens or host species. six of the putative species could form polymorphic pairs: ostertagia ostertagi and ostertagia lyrata, ostertagia leptospicularis and ostertagia kolchida, teladorsagia circumcincta and tel ... | 1993 | 8300286 |
| the systematics of nematodes that cause ostertagiasis in domestic and wild ruminants in north america: an update and a key to species. | studies of medium stomach worms (subfamily ostertagiinae) of domestic and wild ruminants in north america have refined our understanding of the systematics, host distribution and biogeography of these nematodes. strong support for recognition of monophyly for the ostertagiinae has resulted from preliminary phylogenetic analyses of morphological characters among these and other trichostrongylids. evaluation of morphological and biochemical characters in our laboratory and elsewhere has not refute ... | 1993 | 8484224 |
| comparisons of two polymorphic species of ostertagia and phylogenetic relationships within the ostertagiinae (nematoda: trichostrongyloidea) inferred from ribosomal dna repeat and mitochondrial dna sequences. | the first internal transcribed spacer dna (its-1) (rdna) and the mitochondrial (mt) dna-derived cytochrome oxidase i gene (cox-1) were enzymatically amplified, cloned and sequenced from 6 nominal species of ostertagiinae as well as haemonchus contortus and haemonchus placei. the portion of the cox-1 gene analyzed was 393 base pairs (bp) in length and contained 33 within species polymorphic base changes at 28 synonymous sites. the its-1 rdna consensus sequences ranged from 392 bp (ostertagia oste ... | 1998 | 9714215 |
| 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 |
| 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 |
| 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 |
| a survey of the gastrointestinal nematodes of spanish ibex (capra pyrenaica) in a high mountain habitat. | we analyzed the content of the abomasum (n = 79) and small intestine (n = 83) of spanish ibex from sierra nevada natural park, southern spain. fifteen species of trichostrongylid nematodes were identified, 4 of which were found for the first time in this host, i.e., nematodirus fillicollis, n. oiratianus, ostertagia lyrata, and o. ostertagi. teladorsagia circumcincta and marshallagia marshalli were the most abundant abomasal species, whereas n. abnormalis, n. davtiani, and n. oiratianus were dom ... | 2003 | 12760646 |
| the nematodes ostertagia lyrata sjöberg, 1926, and trichostrongylus longispicularis gordon, 1933, in british cattle. | | 1959 | 13666893 |
| occurrence of ostertagia lyrata sjoberg, 1926, in cattle from california and its morphology. | | 1962 | 14477104 |
| efficacy of a topical formulation of eprinomectin against endoparasites of cattle in new zealand. | two controlled studies involving 24 cattle were conducted in new zealand to determine the efficacy of a topical, non-flammable formulation of eprinomectin against induced and naturally acquired nematode infections. in trial 1, nematode infections were induced on day -5 with third-stage larvae of cooperia spp., haemonchus contortus, ostertagia ostertagi and trichostrongvlus colubriformis so that the nematodes would be at the fourth larval stage when the cattle were treated. in trial 2, cattle had ... | 1997 | 16031938 |
| [on the conspecificity of ostertagia ostertagi and ostertagia lyrata (nematoda: ostertagiinae)]. | partial sequences of the second internal transcribed spacer (its-2) rdna were obtained for ostertagia ostertagi and o. lyrata, which are supposedly constitute two morphologically distinct variants of the species. the 1.4% level of difference between the its-2 sequences of o. ostertagi and o. lyrata was reported, whereas the sequences derived from worms of the same morph were completely identical. the data obtained prevent an attribution of o. ostertagi and o. lyrata to the same species. | 2010 | 20795486 |
| 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 |
| 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 |
| 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 |