Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| concurrent daily infection of calves with fasciola hepatica and ostertagia ostertagi. | three groups of calves were infected daily with either 1500 ostertagia ostertagi larvae, 20 fasciola hepatica metacercariae, or 1500 o ostertagi plus 20 f hepatica metacercariae. weekly measurements were taken of calf weight, faecal egg output, plasma concentrations of albumin, plasma activities of sorbitol dehydrogenase, gamma glutamyl transpeptidase and pepsinogen and standard haematological indices. calves were killed either 10 or 21 weeks after daily infections began. f hepatica infection ha ... | 1978 | 34850 |
| occurrence of gastrointestinal parasites in georgia cattle. | a survey of gastrointestinal nematodes in georgia cattle was conducted from 1968 through 1973 from actual worm counts from viscera of 145 slaughtered beef cattle or from egg counts made from fecal samples from 3,273 beef and 100 dairy cattle. beef cattle were grouped as calves, yearlings, and cows. dairy cattle were grouped as calves, replacement heifers, and cows. results of fecal examinations positive; 99.5, 99.3, 99.6, and 41.2% of the calves, yearlings, drylot calves, and cows, respectively, ... | 1975 | 123711 |
| [experimental investigations on the effectiveness of fenbendazole in parasitic helminths of the stomach, intestines and lung of cattle (author's transl)]. | helminth-free bulls were injected artificially with ostertagia ostertagi (120 000 l3), cooperia oncophora (240000 l3), haemonchus spec. (1 000 l3) and/or dictyocaulus viviparus (60 l3/kg) orally or intraruminally. the animals were treated with fenbendazole during the prepatent period or after having reached maturity. the effect of 5 mg fenbendazole/kg p.o. on 3-d, 10-d- and adult stages of ostertagia ostertagi, haemonchus spec. and cooperia oncophora ranges between less than 94% and 100%. partic ... | 1975 | 125016 |
| controlled test of anthelmintic activity of levamisole administered to calves via drinking water, subcutaneous injection, or alfalfa pellet premix. | a controlled test of the activity of 3 formulations of levamisole, at the dose level of approximately 8 mg/kg, against naturally occurring infections of gastrointestinal parasites and lungworms was made in 24 calves allotted to 4 groups of 6 calves each. levamisole was administered to group i calves in the drinking water, to group ii calves by subcutaneous injection, and to group iii calves by feeding alfalfa pellets mixed in corn silage; group iv calves were nontreated controls. group i calves ... | 1975 | 125055 |
| the control of adult parasitic nematodes of cattle with morantel tartrate. | the anthelmintic efficacy of morantel tartrate at 5mg/kg bodymass was investigated in three separate controlled trials comprising 68 calves. high anthelmintic activity was established against adult haemonchus placei, ostertagia ostertagi, cooperia spp. (c.pertinata and c. punctata), bunostomum phlebotomum and oesophagostomum radiatum. | 1975 | 131197 |
| evaluation of oxfendazole against natural infections of gastro-intestinal nematodes and lung-worms in calves. | the anthelmintic activity of oxfendazole (syntex) was tested in calves at dosages of 2-5 and 5-0 mg per kg. at both dose levels, oxfendazole showed 100 per cent efficacy against adult ostertagia ostertagi, o lyrata, o cremensis, fifth stage ostertagia spp and adult haemonchus spp. against adult cooperia oncophora, efficacy was 99.8 per cent and 100 per cent at doses of 2.5 mg per kg and 5.0 mg per kg respectively while at both dose levels 100 per cent activity was recorded against c surnabada an ... | 1976 | 136085 |
| levamisole: anthelmintic activity in calves following dermal application. | a series of seven experiments designed to evaluate the anthelmintic efficacy of levamisole (1-tetramisole) by dermal application is described. this work involved use of 181 artificially infested calves. the drug was formulated at a concentration of 10% m/v levamisole base in a solvent system promoting dermal absorption and was applied to both sides of the spine in the lumber region at a dose rate of 10 mg levamisole base per kg livemass. a consistent performance was achieved in these investigati ... | 1977 | 144190 |
| 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 |
| effect of albendazole on gastrointestinal parasites of cattle. | the efficacy of albendazole in removing gastrointestinal nematodes and tapeworms was studied in 16 treated and 16 untreated (control) beef calves. the anthelmintic was administered as an oral drench at a dose level of 5 ml/45.5 kg of body weight (5 mg/kg). percentage of efficacy against the various genera was: trichostrongylus axei, oesophagostomum radiatum, and moniezia-100.0; haemonchus placei, cooperia spp, and trichostrongylus colubriformis - greater than 99.0; ostertagia ostertagi -98.3; an ... | 1977 | 145816 |
| [effect of fenbendazole (panacur) against suppressed stages of dictyocaulus viviparus and ostertagia ostertagi in calves]. | 1978 | 152108 | |
| ostertagiosis in captive bison in new york state: report of nine cases. | type ii ostertagiosis was found at necropsy in 9 american bison (bison bison) from 3 farms in new york. clinical signs included severe diarrhea, emaciation, unthrifty coats, anemia, and weakness. in severely affected animals, the macroscopic abomasal changes consisted of irregular thickening and edema of the mucosa, resulting in a pebbly or morocco-leather appearance. microscopically, many gastric pits and glands were dilated, lined by hyperplastic epithelium, and contained nematode sections or ... | 1979 | 157257 |
| efficacy of albendazole for treatment of naturally acquired nematode infections in washington cattle. | albendazole, methyl 5-propylthio-1h-benzimidazol-2-yl carbamate, was given as a bolus (7.68 to 8.18 mg/kg of body weight) to cattle naturally infected with gastrointestinal nematodes and lungworms in a controlled trial. over 99% of adult ostertagia ostertagi, trichostrongylus longispicularis, cooperia oncophora, nematodirus helvetianus, and dictyocaulus viviparus were removed by the treatment. efficacy against immature o ostertagi, early fourth-stage o ostertagi, and oesophagostomum radiatum was ... | 1979 | 157705 |
| the efficacy of fenbendazole at a dosage rate of 7,5 mg/kg against nematode infestations in cattle. | fenbedazole, dosed to artificially infested cattle at 7,5 mg/kg live mass, was more than 80% effective in more than 80% of the treated animals against immature and adult haemonchus placei, ostertagia ostertagi; cooperia spp., bunostomum phlebotum and oesophagostomum radiatum. | 1979 | 162147 |
| observations on crystals found in the intestinal cells of haemonchus contortus and in the intestinal lumen of ostertagia ostertagi. | 1978 | 204587 | |
| fenbendazole against inhibited early-fourth-stage ostertagia ostertagi in cattle. | 1977 | 270641 | |
| the effect of fenbendazole in removing inhibited early-fourth-stage ostertagia ostertagi from yearling cattle. | 1977 | 275711 | |
| anthelmintic efficacy of albendazole in cattle: comparison of critical and controlled tests. | twelve calves were experimentally inoculated with 6 species of gastrointestinal nematodes and the liver fluke, fasciola hepatica. six calves were administered albendazole at 10 mg/kg of body weight, and the drug efficacy was determined by critical and controlled tests. albendazole was only 74% effective against haemonchus contortus (cambendazole-resistant strain), 99 to 100% effective against ostertagia ostertagi, trichostrongylus colubriformis, cooperia oncophora, and oesophagostomum radiatum, ... | 1977 | 334003 |
| [helminth fauna of syrian cattle]. | in this work the stomach and the small intestine of 34 and the large intestine of 4 more cattle were examined. 91,17% of the examined cattle (31 in 34 animals) had infected the stomach and/or the small intestine by parasites. 14 kinds of nematodes were found. the average intensity of infection of the stomach was higher than that of the small intestine. with the exception of higher infection in 3 stomachs and 2 small intestines the intensity of infection in all other cases was from small to mediu ... | 1979 | 453633 |
| avermectins, new family of potent anthelmintic agents: efficacy of the b1a component. | when given to sheep as a single oral dose at 0.1 mg/kg, the b(1a) component of the avermectins caused a reduction of >95% in the numbers of haemonchus contortus, ostertagia circumcincta (including inhibited l(4) larvae), trichostrongylus axei, trichostrongylus colubriformis, cooperia oncophora, and oesophagostomum columbianum. when given to cattle as a single oral dose at 0.1 mg/kg, avermectin b(1a) was >95% effective in reducing the numbers of haemonchus placei, ostertagia ostertagi (including ... | 1979 | 464563 |
| anthelmintic efficiency of oxfendazole, fenbendazole and levamisole against naturally acquired infections of ostertagia ostertagi and trichostrongylus axei in cattle. | the anthelmintic efficiencies of oxfendazole, fenbendazole and levamisole, each at 4 dose rates spanning the manufacturers' recommended dosages were compared in beef cattle with naturally acquired infections of ostertagia ostertagi and trichostrongylus axei. in 8 of the 9 cases tested there was no significant increase in anthelmintic efficiency due to increased dose rates of any of the drugs. percentage efficiencies and their standard errors, calculated from mean worm counts of pooled data for a ... | 1979 | 464935 |
| efficacy of oxfendazole against inhibited ostertagia ostertagi in naturally infected cattle. | oxfendazole was administered to pregnant cows at 2.5 and 5 mg/kg body weight to determine the anthelmintic efficacy against naturally acquired larvae which became inhibited at the early 4th stage. the experimental design included three groups of orally-treated cows, that is, 10 placebo treated control cows, 11 cows treated with 2.5 mg/kg of oxfendazole and 10 cows treated with 5.0 mg/kg of oxfendazole. oxfendazole at 2.5 mg/kg body weight was 82 and 94% effective against el-4 and adult o. ostert ... | 1979 | 475680 |
| activity against ostertagia ostertagi of low doses of oxfendazole continuously released from intraruminal capsules in cattle. | slow release from intraruminal capsules of 0.48 mg/kg oxfendazole per day for 5.5 days gave percentage efficiencies of 99 +/- 0.6, 86.6 +/- 6.3 and 93.1 +/- 4.5 for the removal of adult worms, developing 4th stages and inhibited larvae of ostertagia ostertagi respectively. these efficiencies were not significantly different from those obtained from a single oral dose of 2.5 mg/kg. peak plasma levels of oxfendazole were similar for the 2 types of administration but high levels were maintained lon ... | 1979 | 475682 |
| the activity of albendazole against adult and larval gastrointestinal nematodes in naturally infected calves in the netherlands. | the activity of albendazole against gastrointestinal helminths in naturally infected calves in the netherlands was tested. the calves were in their first grazing season and kept in two groups of ten. one of these groups was grazed alternately with sheep. five out of each group were drenched with albendazole (7.5 mg/kg) on the day they were housed (november 1). before and 2, 14, and 28 days after treatment individual faecal samples were taken from all calves and larval cultures were made. ten cal ... | 1979 | 494213 |
| seasonal transmission of bovine gastrointestinal nematodes in the texas gulf coast. | sentinel calves were placed in pastures for 1 month in two environmentally dissimilar areas of the texas gulf coast to determine the seasonal transmission of various gastrointestinal nematodes. transmission was determined for cooperia spp, haemonchus placei, ostertagia ostertagi, and trichostrongylus axei. large numbers of cooperia spp were acquired from may through november, with the peak of transmission occurring in july and august. haemonchus placei was encountered on both field sites but was ... | 1979 | 500427 |
| on the possible role of earthworms in the transmission of ostertagia ostertagi third-stage larvae from feces to soil. | 1979 | 512781 | |
| observations on ostertagiasis in young cattle over two grazing seasons with special reference to plasma pepsinogen levels. | the epidemiology of ostertagiasis in south west scotland was studied in groups of cattle grazed through two successive grazing seasons separated by a period of winter housing. towards the end of the first grazing season (september) the numbers of infective larvae (l3) on the pasture had increased to high levels (up to 24,000 l3 per kg) which resulted in high faecal egg counts, worm burdens, plasma pepsinogen levels and the occurrence of clinical ostertagiasis in the calves. by late spring (may) ... | 1979 | 524707 |
| the effect of a preparturient fenbendazole treatment on lactation yield in dairy cows. | studies carried out on nine farms in north-west england indicated that fenbendazole treatment of adult winter calving dairy cows in the dry period caused an overall increase of 173 kg in their subsequent lactation yield. there was some evidence to suggest that a correlation existed between pasture ostertagia ostertagi larval burdens and subsequent serum pepsinogen and milk yield responses post treatment. marked interherd and regional differences existed in the milk yield response to anthelmintic ... | 1979 | 524709 |
| gastrointestinal nematode immunization trials in cattle. | three experiments were conducted to immunize calves against ostertagia ostertagi, trichostrongylus axei, and t colubriformis. calves were given intraperitoneal injections with in vitro-grown parasitic larvae of the three species and iv and intraperitoneal injections of exoantigens obtained from culture media used to grow o ostertagi. none of the treatments provided immunity to subsequent oral challenge exposure with normal infective larvae. | 1979 | 525900 |
| activity of fenbendazole against inhibited early fourth-stage larvae of ostertagia ostertagi. | the efficacy of fenbendazole (panacur, hoechst-roussel) against inhibited early fourth-stage larvae of ostertagia ostertagi and other nematodes of the abomasum and intestinal tract was investigated in naturally infected, yearling cattle in april 1978. the time when peak levels of inhibited larvae occurred was determined by epizootiologic study which began in november 1977. all animals were removed from pasture and maintained free from further helminth infection until slaughter (19 to 21 days). t ... | 1979 | 525912 |
| anthelmintic activities of b1a fraction of avermectin against gastrointestinal nematodes in calves. | anthelmintic activities of the b1a fraction of avermectin were evaluated in a controlled experiment. twenty 12-week-old calves artificially infected with gastrointestinal nematodes were allotted to four groups. calves in group 1 were used as nonmedicated controls; other calves in groups 2, 3, and 4 were given (orally) b1a avermectin at dosage levels of 50, 100, and 200 microgram/kg of body weight, respectively. these treatments were given 35 days after calves were inoculated with infective nemat ... | 1979 | 525922 |
| the efficacy of thiophanate against gastrointestinal nematodes of cattle including inhibited larvae of ostertagia ostertagi. | 1979 | 532051 | |
| efficacy of anthelmintics against cattle nematodes. | the efficacies of fenbendazole and thiabendazole against artifically acquired cattle nematodes and the efficacies of fenbendazole, prabendazole and levamisole against naturally acquired cattle nematodes were studied in western victoria. fenbendazole significantly (p less than 0.05) reduced numbers of late and early fourth stage larvae (greater than 96%), artificially acquired cooperla spp (100%) and naturally acquired adult ostertagia ostertagi (98%) and trichostrongylus axei (90%). thiabendazol ... | 1979 | 533489 |
| the effect of age, acquired resistance, pregnancy and lactation on some reactions of cattle to infection with ostertagia ostertagi. | an experiment is described in which the effects of age, previous infection, pregnancy and lactation on some reactions of cattle to infection with ostertagia ostertagi were studied. it was found that an acquired resistance to the establishment of worms developed more rapidly in 20-month-old heifers than in calves, that it was unaffected by pregnancy of the host but that it was largely lost by heifers in early lactation. the rate at which populations were turned over, i.e. the mean life-span of wo ... | 1979 | 542317 |
| observations on the resumption of development of inhibited ostertagia, cooperia and nematodirus infections in calves stabled overwinter. | two groups of three month old, parasite-free calves grazed a permanently infected pasture for 14 days, group a during the first two weeks of september and group b during early november. half of each group was killed 14 days after removal from the pasture and the remainder stabled overwinter before slaughter and parasitological examination. marked inhibition of development occurred for cooperia oncophora with a variable lower level of inhibition for ostertagia ostertagi and practically none for n ... | 1979 | 548165 |
| bovine ostertagiasis: a changing epidemiological pattern? | an unusual epidemiological pattern in bovine ostertagiasis is described in which clinical ostertagiasis occurred in calves grazed on a silage aftermath from late july. the calves were treated with the anthelmintic levamisole prior to grazing the aftermath and the latter had not been grazed since the previous autumn. analysis of the herbage larval counts suggests that delayed emergence of overwintered ostertagia ostertagi l3 from the soil was the most likely source of the infection. | 1979 | 555116 |
| a prediction model for bovine ostertagiasis. | a mathematical model based on development and mortality rates, and incorporating data on the infectivity, fecundity and migratory behaviour of ostertagia ostertagi, was used to predict the level of pasture contamination and the occurrence of clinical ostertagiasis in grazing calves during 1975 and 1976. a comparison of the predicted and observed events showed a good correlation. | 1979 | 555121 |
| the digestive utilization of the diet in calves experimentally infected with ostertagia ostertagi. | the experimental infection of calves with 250,000 l larvae of ostertagia ostertagi per animal did not produce great variations in the digestibility of the diet administered. the infection retarded normal growth the resulted in an unfavourable conversion index. | 1977 | 560346 |
| cryopreservation of the infective larvae of the common nematodes of ruminants. | exsheathed infective larvae (l 3) of 19 species of nematodes were tested for infectivity in either sheep or cattle after they had been frozen in 0,9% nacl solution, stored for a relatively short time in the gas phase of liquid nitrogen and subsequently thawed. in addition, 13 of these species were tested after similar storage for up to 18 months. in sheep, haemonchus contortus, ostertagia circumcincta, trichostrongylus axei, trichostrongylus colubriformis, nematodirus spathiger and oesophagostom ... | 1977 | 566412 |
| anthelmintic efficacy of oxfendazole in calves. | oxfendazole, methyl [5-(phenylsulfinyl)-1h-benzimidazol-2-yl]carbamate given to calves at dose level of 2.5 mg/kg as a paste, as a bolus, or as a drench resulted in excellent (97 to 100%) anthelmintic efficacy against mature ostertagia ostertagi, trichostrongylus axei, cooperia oncophora, c mcmasteri, c pectinata, c punctata, nematodirus helvetianus, trichostrongylus longispicularis, chabertia ovina, and oesophagostomum radiatum. against the early 4th stage larvage of o ostertagia and n helvetia ... | 1978 | 567947 |
| plasma pepsinogen levels in some experimental infections of ostertagia ostertagi in cattle. | two groups of calves were infected with larvae of ostertagia ostertagi to establish large numbers of adults and arrested larvae. in one group symptoms of ostertagiasis were seen and there was a loss of three months growth; in the other, in which adult worms were removed by a single anthelmintic treatment, there was only a transient reduction in live-weight gain. plasma pepsinogen levels were however the same in the two groups and followed the same course. even after 25 weeks, when calves had bee ... | 1978 | 570316 |
| [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 |
| the efficiency of levamisole, thiabendazole and fenbendazole against naturally acquired infections of ostertagia ostertagi in cattle. | in two experiments, conducted in cattle with naturally acquired infections of ostertagia ostertagi, comparative assessments were made of the anthelmintic efficiency of levamisole, thiabendazole and fenbendazole, each at 1.0, 1.5 and 2.0 times the recommended dose rate. variable efficiencies of 81 and 49 per cent for levamisole, 86 and 56 per cent for thiabendazole were obtained against adult o ostertagi. neither drug showed substantial activity against early fourth stage larvae. efficiency of fe ... | 1977 | 605297 |
| efficacy of albendazole against inhibited early fourth stage larvae of ostertagia ostertagi. | twelve untreated controls and 12 treated beef yearling steers were used in trials of albendazole (smith kline animal health products) at 7.5 mg per kg (oral drench) against natural infections of inhibited fourth stage larvae of ostertagia ostertagi. albendazole had an efficacy of 83.8 per cent in removal of inhibited larvae. the mean number of inhibited larvae in untreated controls was 48.9 per cent. efficacy against developing stages and adults of o ostertagi was 92.8 and 99.7 per cent, respect ... | 1977 | 605476 |
| studies on nematode infections of beef cattle in new south wales. | the occurrence and seasonal trends of nematode parasite infections in beef cattle on the tablelands and north coast regions of new south wales are described, based on worm counts from 627 spring-born steers slaughtered at 2-monthly intervals from 6 to 24 months of age. the predominant parasites were ostertagia ostertagi, trichostrongylus axei and cooperia spp. large burdens of adult ostertagia were seen in 12-month-old animals in late winter and early spring, and later in 18- to 20-month-old cat ... | 1977 | 614021 |
| arrested development of ostertagia ostertagi and cooperia oncophora: effect of the time of year on the conditioning and deconditioning of infective larvae. | 1978 | 621298 | |
| the effect of diet on the establishment and growth of ostertagia ostertagi in calves. | three groups of four calves were raised parasite-free. each group received a different diet. at the moment of infection one group was fed with milk equivalent artificially dried grass, and concentrates, the second with water, grass pellets (16 mm), and concentrates, while the third was fed with water, artificially dried grass, and concentrates. each animal was infected at an age of 8 weeks with 10,000 larvae of ostertagia ostertagi and necropsied 28 days later, no significant differences between ... | 1978 | 644564 |
| activity of oxfendazole against inhibited larvae of ostertagia ostertagi and cooperia oncophora. | 1978 | 644827 | |
| factors involved in the relative anthelmintic tolerance of arrested 4th stage larvae of ostertagia ostertagi. | 1978 | 644835 | |
| anthelmintic activity of fenbendazole against gastrointestinal nematodes in calves. | anthelmintic activities of fenbendazole were evaluated in a controlled experiment. forty calves artificially infected with gastrointestinal nematodes were allotted to 4 groups. calves in group 1 were used as nonmedicated controls; the other calves were given (orally) fenbendazole at the dose level of 5 mg/kg in the forms of a suspension (group 2), medicated feed to individual calves (group 3), and medicated feed to the group (group 4). these treatments were given on day 35 after calves were inoc ... | 1978 | 677528 |
| autumn and winter fenbendazole treatment against inhibited 4th stage ostertagia ostertagi larvae in cattle. | 1978 | 706122 | |
| the length of ostertagia ostertagi in populations of uniform age. | 1978 | 748215 | |
| in vitro and in vivo studies on the ovicidal activity of fenbendazole. | the in vitro ovicidal activity of fenbendazole against eggs of ostertagia ostertagi, haemonchus contortus and trichostrongylus colubriformis was observed using different concentrations of active principle. the optimum concentration for ovicidal activity is evidently 0.5 ppm fenbendazole. a further increase in concentration results in a decrease in activity which is probably due to physical causes. ovicidal activity of the product is assessed by the proportion of non embryonated eggs as well as e ... | 1978 | 749077 |
| [effect of fenbendazole (panacur) in sheep naturally invaded by gastrointestinal and lung nemtaodes]. | the paper presents the results of the clinical tests of fenbendazole (panacur, produced by hoechst, f. r. g.), a new antihelminthic preparation. the tests were performed in sheep naturally invaded by gastrointestinal and lung nematodes. helminthological dissection performed 7 days after the application of 5 mg of fenbendazole per 1 kg of sheep weight proved 100% effectiveness on lungworms (dictyocaulus filaria) and on the following gastrointestinal helminths: ostertagia ostertagi, haemonchus con ... | 1975 | 812246 |
| [clinical examination of the blood of red deer (cervus elaphus l.) naturally infested with parasites]. | in six animals hunted and four immobilized animals of red deer (cervus elaphus l.) of both sexes and of different age, kept at three game preserves in bohemia, the psychological values were ascertained: the number of erythrocytes and leucocytes, the hemoglobin content, the hematocrit, mcv, mch, mchc, the white blood count, the total serum protein, the fractions: albumin, alpha-, beta- and gamma-globulin, the activity of sgot, and sgpt, the alkaline phosphatase and the metabolism of calcium, phos ... | 1976 | 820034 |
| in vitro cultivation of ostertagia ostertagi, the medium stomach worm of cattle. i. development from infective larvae to egg-laying adults. | when a 70-min exsheathing process and two-step roller culture system were used, infective larvae of ostertagia ostertagi developed in large numbers to mature adult males and females in 28 and 29 days, respectively. females laid fertile eggs in the 2- to 16-cell stages from day 34 on. some of the expelled eggs developed to the morula stage, in the culture fluid, by day 52. yields of mature adults and eggs were best when cultures were started with 100,000 larvae in 100 ml of medium. the optimal cu ... | 1977 | 864570 |
| action of fenbendazole on arrested fourth stage larvae of ostertagia ostertagi. | 1977 | 898643 | |
| recovery of infective 3rd stage larvae of haemonchus contortus and ostertagia ostertagi by migration in agar gel. | 1977 | 910655 | |
| influence of ostertagia ostertagi and cooperia infections on the energetic efficiency of steers fed a concentrate ration. | studies on effects of subclinical parasitism (low worm burden) in full-fed and maintenance-fed steers indicated that over a short interval low worm burdens do not have a statistically significant effect on the efficiency of energy utilization. in full-fed steers, energy retention tended to be higher in steers with lower worm burdens (mean 95.8 ostertagia, 12.5 cooperia) than in those with higher worm burdens (mean 677.5 ostertagia, 201.8 cooperia). maintenance-fed steers generally had larger num ... | 1977 | 911083 |
| the activity of fenbendazole against inhibited 4th stage larvae of ostertagia ostertagi [ letter]. | 1977 | 919274 | |
| anthelmintic activity of albendazole against gastrointestinal nematodes in calves. | anthelmintic activities of albendazole were evaluated in a controlled experiment. forty calves experimentally infected with gastrointestinal nematodes were allotted to 4 groups. calves in group 1 were used as nonmedicated controls; calves in groups 2, 3, and 4 were given (by oral route) a suspension containing albendazole at dose concentrations of 2.5, 5.0, and 7.5 mg/kg of body weight on the 35th day after administration of infective nematode larvae. in groups 2, 3, and 4 calves, average overal ... | 1977 | 921039 |
| density-dependent survival in populations of ostertagia ostertagi. | 1977 | 924718 | |
| [investigations concerning bovine gastro-intestinal strongyles. ii. seasonal variations in the herbage infestation with infective larvae (author's transl)]. | ecological studies of bovine gastro-intestinal trichostrongylide larvae have been carried on during a three-year period (1972-1974). the studies mainly included pastures grazed by heifers (2nd time grazing cattle). examination of the herbage samples was based on washing and filtration (sieve mesh-size 36 and 28 mu) followed by baermann test on the debris. the pasture infestation with infective larvae (l3) followed a nearly stereotype seasonal pattern (cf. fig. 2 and fig. 3): a considerable larva ... | 1976 | 934805 |
| the successful removal of inhibited fourth stage ostertagia ostertagi larvae by fenbendazole. | 1976 | 945632 | |
| [a simple flotation and mcmaster method (author's transl)]. | a simple and hygienic flotation and mcmaster method is described (cf. fig. 1): the faeces sample (3-5 gm) is mixed with flotation fluid (40-60 ml) in a disposable plastic cup (cup i) and a circular piece of gauze, with a diameter equivalent to twice the height of the cup plus the diameter of its base, is placed over the cup. by a similar cup (cup ii), with the bottom cut off and slits made in the side, the gauze is pressed down in cup i. by this procedure the faeces suspension will be filtered t ... | 1976 | 958869 |
| efficacy of oxibendazole against gastrointestinal nematodes of cattle. | in 3 separate studies, oxibendazole in drench and premix formulation was shown efficacious against larvae and adults of the genera haemonchus, ostertagia, trichostrongylus, strongyloides, nematodirus, cooperia, bunostomum, capillaria, oesophagostomum, and trichuris. in the first study, artificially infected calves were cleared of virtually all histotrophic larvae and adult parasites after medication with oxibendazole drench at a dose level of 10 mg/kg of body weight. smaller doses (7.5 and 5.0 m ... | 1976 | 984548 |
| the resumed development of arrested ostertagia ostertagi in experimentally infected calves. | 1976 | 993385 | |
| efficacy of albendazole against gastrointestinal nematodes of cattle. | forty-five calves with artificial and pasture-acquired nematode infections were medicated with albendazole at dose levels of 0, 2.5, 5.0, or 10 mg/kg of body weight. a dose level of 2.5 mg/kg removed at least 99% of adult trichostrongylus axei, trichostrongylus colubriformis, cooperia oncophora, and bunostomum phlebotomum. burdens of haemonchus contortus, strongyloides papillosus, and ostertagia ostertagi were reduced 79, 88, and 97%, respectively. at a dose level of 5.0 mg/kg, at least 95% of a ... | 1976 | 999077 |
| investigation of maturation requirements for ostertagia ostertagi and cooperia oncophora larvae. | infection of parasite-free six to eight week old calves with doses of 50,000 mixed ostertagia ostertagi and cooperia oncophora larvae varying in age from seven to 42 days did not reveal a significant larval maturation requirement. | 1976 | 1000395 |
| arrested development of ostertagia ostertagi and cooperia oncophora. effect of temperature at the free-living third stage. | 1975 | 1168660 | |
| inhibited development in haemonchus contortus. | inhibited development of haemonchus contortus was studied in single experimental infections of worm-free lambs. chilling of the infective larvae at +4 degrees c was without effect on the percentage of larvae subsequently becoming inhibited and a period of exposure to autumnal conditions was unnecessary to induce a high rate of inhibition. it was concluded that seasonal inhibition of h. contortus in east anglia is brought about primarily by an environmental stimulus acting upon the preparasitic s ... | 1975 | 1187184 |
| attempts to produce protection against ostertagia ostertagi in cattle. | various single or multiple doses of ostertagia ostertagi were administered to young calves, and the production of protection phenomena elicited by single challenge inoculations ranging from 50,000 to 300,000 larvae or multiple challenge inoculations totaling 98,000 and 300,000 larvae was investigated. with some regimens, the vaccinations apparently resulted in protection against challenge exposure, as reflected by 36 to 56% fewer worms becoming established in challenge-exposed vaccinated calves ... | 1976 | 1247199 |
| the effect of genetic factors on the vulval flap of ostertagia ostertagi. | 1976 | 1254394 | |
| observations on the resumed development of arrested ostertagia ostertagi in naturally infected yearling cattle. | 1976 | 1254747 | |
| inoculation of conventionally and specific-pathogen-free reared rabbits with ostertagia ostertagi isolated from cattle. | eleven trials were conducted to collect helminthologic and pathologic data from 27 conventionally reared (cr) and 53 specific-pathogen-free (spf) 6- to 13-week-old male new zealand white rabbits. these rabbits were given 50,000 to 100,000 ensheathed third-stage infective ostertagia ostertagi larvae (l3) orally. the l3 had been isolated from the feces of cattle. fecal egg counts were conducted and worm populations were determined after euthanasia 3 to 56 days after inoculation. at necropsy, nodul ... | 1992 | 1385683 |
| 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 the morantel sustained release trilaminate bolus against gastrointestinal nematodes and its influence on immunity in calves. | an experiment was conducted in calves to investigate the efficacy of a morantel sustained release trilaminate bolus (msrt) to control gastrointestinal parasitism and to assess the development of immunity during the use of msrt. two groups (m and u) of four calves each were infected three times a week with a mixed ostertagia ostertagi and cooperia oncophora infection for 12 weeks. calves of group m received an msrt at the start of the experiment. twenty weeks after the start of the experiment, al ... | 1992 | 1441195 |
| antigenic differences between the life cycle stages of cooperia oncophora. | the antigenic differences among the life cycle stages of cooperia oncophora were studied by sds-gel electrophoresis and western blotting. sodium dodecylsulphate polyacrylamide gel electrophoresis of the different life cycle stages of c oncophora revealed a complex protein pattern with a decreasing number of protein bands towards the adult stages. several bands of the fourth stage larvae were in common with both the third stage and the adult nematode. western blotting with sera from c oncophora m ... | 1992 | 1465515 |
| seasonal patterns of total and ostertagia-specific ige in grazing cattle. | serum samples, collected monthly from january through december 1988 from 10 cows, their calves, and 10 yearling heifers, were used to determine total and ostertagia-specific ige levels. in addition, serum pepsinogen concentration, fecal egg counts, and body weights were measured. the following observations were made. (1) total and ostertagia-specific ige levels followed similar seasonal patterns, being generally highest in the spring. (2) breed and/or sire effects on total ige levels were observ ... | 1992 | 1466130 |
| attempts to immunize cattle against ostertagia ostertagi infections employing 'normal' and 'chilled' (hypobiosis-prone) third stage larvae. | immunity to ostertagia ostertagi infections in calves develops slowly and only becomes manifest towards the end of a grazing season in which they have been exposed to the parasite. in an attempt to hasten the onset of immune reactions, three immunization protocols were set up. twenty four heifers were allocated into four groups. beginning in january, animals in two of the groups were inoculated with four 1-monthly increasing dosages of either 'normal' or 'chilled' (hypobiosis-prone) larvae, thos ... | 1992 | 1466132 |
| effects of clinically apparent and subclinical ostertagia ostertagi infections on nitrogen and water metabolism in calves. | four balance trials were conducted in 3 groups of 5 calves each at 0, 4, 8, and 14 weeks after initial inoculation with ostertagia ostertagi. group-1 calves were inoculated with 100,000 third-stage larvae (l3) of o ostertagi/wk for 14 weeks. group-2 calves were inoculated with 10,000 l3/wk for 14 weeks, and group-3 calves were not inoculated. effects of infection on apparent digestibilities of dry matter and nitrogen, and balances of nitrogen and water were evaluated. neither clinically apparent ... | 1992 | 1466493 |
| nutritional and pathophysiologic effects of clinically apparent and subclinical infections of ostertagia ostertagi in calves. | nutritional and physiologic effects of clinically apparent and subclinical ostertagia ostertagi infections were studied in 3 groups of 5 calves each. group-1 calves were inoculated with 100,000 ostertagia ostertagi third-stage larvae (l3)/calf/wk for 14 weeks. group-2 calves were inoculated with 10,000 l3/calf/wk for 14 weeks, and group-3 calves were no inoculated. calves in group 1 had decreased dry matter intake and feed utilization from 4 weeks after initial inoculation. group-2 calves had no ... | 1992 | 1466494 |
| effects of ostertagia ostertagi infection on secretion of metabolic hormones in calves. | effects of ostertagia ostertagi infection on secretion of insulin, pancreatic glucagon, cortisol, gastrin, and pepsinogen were studied in calves inoculated with 100,000 (group 1) or 10,000 (group 2) o ostertagi infective larvae weekly for 14 weeks. plasma insulin concentrations in both inoculated groups were lower than those in a non-infected (group 3) control group. the differences between group 1 and group 3 were significant (p < 0.05) at 2 and 12 weeks after initial inoculation. plasma pancre ... | 1992 | 1466495 |
| isolation of putative cysteine protease genes of ostertagia ostertagi. | recombinant phage containing putative ostertagia ostertagi cysteine protease genes have been isolated from a lambda embl-3:genomic dna library using a haemonchus contortus cathepsin b-like cysteine protease cdna as hybridization probe. restriction enzyme maps of the phages suggest that they identify at least 3 genes, 2 of which appear to be linked in tandem. the complete nucleotide sequence of one gene, cp-1, was determined. the cp-1 gene appears to be organized into 12 exons than span 4.5 kb of ... | 1992 | 1475000 |
| development of immunity to ostertagia ostertagi (trichostrongylidae: nematoda) in pastured young cattle. | this experiment comprised 3 groups of calves, (+p2), (-p2) and (-p1), which all started their first grazing season as parasite-free calves. the (+p2)- and (-p2)-group grazed 2 seasons. in the first season the (-p2)-group of calves was grazing a pasture with no detectable trichostrongyles and treated with anthelmintics every second week. the untreated (+p2)-group grazed an ostertagia ostertagi contaminated pasture. during the second grazing season these 2 original groups grazed together with a ne ... | 1992 | 1488946 |
| 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 |
| modulation of calf immune responses by ostertagia ostertagi: the effect of diet during trickle infection. | the effects of ostertagia ostertagi infection and diet on antibody responses to o. ostertagi third stage larval (l3) antigen and to an unrelated antigen, keyhole limpet haemocyanin (klh) were determined in calves experimentally infected with 3000 l3 on alternate days for 6 weeks. calves were given one of two diets, and were either infected or not infected with o. ostertagi l3. the diets were either high (h) or low (l) in protein/energy and were within the range of normal husbandry practice in th ... | 1992 | 1514241 |
| 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 |
| establishment and pathogenicity of two strains of ostertagia ostertagi and cooperia oncophora in calves in different locations. | an experiment was carried out simultaneously in glasgow and in wageningen to investigate possible differences between the local strains of ostertagia ostertagi and cooperia oncophora. in each location calves of the local friesian breed were infected with 100,000 larvae of either the glasgow or wageningen strain of o ostertagi or c oncophora. at both locations the calves received the same diet. the glasgow strain of o ostertagi was more pathogenic than the wageningen strain and a larger proportio ... | 1992 | 1553434 |
| a natural infection of sheep with ostertagia ostertagi. | 1992 | 1554339 | |
| suitability of mitochondrial dna for assaying interindividual genetic variation in small helminths. | the current paucity of data on the genetic structure of parasitic helminth populations results partly from the lack of a suitable molecular technique for assigning genotypes to small individuals. this report describes the cloning of the mitochondrial dna (mtdna) from a small parasitic nematode, ostertagia ostertagi, and the potential use of this cloned mtdna as a hybridization probe to detect genetic variation among individuals. by using cloned, homologous mtdna, labeled to high specific activit ... | 1992 | 1556654 |
| studies on an ostertagia ostertagi strain suspected to be resistant to benzimidazoles. | four calves were infected with a susceptible (laboratory) strain of ostertagia ostertagi and four with a field strain suspected to be resistant to benzimidazoles. after 25 days two calves from each group were treated with 3.5 mg kg-1 fenbendazole. egg output fell to zero in all treated calves. treated calves did not harbour worms at slaughter 35 days after infection. significant differences between the strains were shown for ed50 values for thiabendazole in the egg hatch assay, but not in the tu ... | 1992 | 1561765 |
| 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 |
| in vivo passage through calves of nematophagous fungi selected for biocontrol of parasitic nematodes. | the experiment was designed to test the survival and performance of stress selected nematophagous fungi after passage through the gastro-intestinal tract of cattle. ruminating calves were fed daily with a fixed amount of fungal material grown on barley grains. the excreted dung was collected on days four and five after the start of the feeding experiment. barley grains were washed out of the excreted dung and incoculated on water-agar plates. after incubation for one week, nine of ten fungal iso ... | 1992 | 1640088 |
| cloning and characterization of the ribosomal rna gene repeat from ostertagia ostertagi. | clones of the rrna genes of ostertagia ostertagi were selected from a library prepared from the genomic dna of adult worms of strain la-2. a 13.4-kb insert in a clone, lambda oor78, is comprised of one complete 7.5-kb rdna unit and portions of two adjacent units. the rdna unit is directly repeated in a head-to-tail fashion and represents approximately 0.9% of the total genomic dna. this repeating unit appears to be the only long tandemly repeated sequence in the genome. restriction enzyme recogn ... | 1991 | 1674820 |
| continued susceptibility of ostertagia ostertagi infective larvae to morantel tartrate. | 1991 | 1763471 | |
| efficacy of albendazole, levamisole and fenbendazole against gastrointestinal nematodes of cattle, with emphasis on inhibited early fourth stage ostertagia ostertagi larvae. | an experiment was conducted to compare the anthelmintic efficacy of albendazole (abz), levamisole (lev) and fenbendazole (fbz) against inhibited early fourth stage larvae (el4) of ostertagia ostertagi during april in louisiana. forty cross-bred beef heifers (average weight 165 kg) were acquired during winter and grazed on pastures contaminated with o. ostertagi and other nematodes until early april. the cattle were weighed and randomly allotted into four groups of ten animals on 6 april and trea ... | 1991 | 1763491 |
| efficacy of levamisole against ostertagia ostertagi in louisiana cattle during maturation of inhibited larvae (september) and during minimal inhibition (december/january). | levamisole (lev) was tested in four experiments to compare efficacy values against ostertagia ostertagi when larval maturation was occurring (september), following inhibition and also when populations were expected to be largely adult (winter). a primary objective was to determine the importance of developing fourth-stage larvae (dl4) and inhibited, early fourth-stage larvae (el4) in replacing adult worms lost through treatment and the effect of this on reduced efficacy against adult worms. youn ... | 1991 | 1763492 |