| 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 |
| [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 |
| 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 |
| 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 |
| arrested development of ostertagia ostertagi and cooperia oncophora. effect of temperature at the free-living third stage. | | 1975 | 1168660 |
| the anthelmintic efficacy of fenbendazole against a mixed nematode infection in sheep. | fenbendazole (methyl-5-(phenylthio)-2-benzimidazole carbamate) at dose rates of 5 mg/kg and above was 100 per cent effective in eliminating a naturally acquired dictyocaulus filaria infection in sheep. the drug was 100 per cent effective in eliminating concurrent infections of adult trichostrongylus axei, haemonchus contortus, haemonchus placei, ostertagia circumcincta, ostertagia ostertagii, cooperia oncophora, cooperia mcmasterii, nematodirus spathiger, neumatodirus filcollis, oesophagostomum ... | 1975 | 1153893 |
| 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 |
| 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 |
| 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 |
| intestinal nematodes of white-tailed deer in southeastern united states. | the small intestine, large intestine, and cecum of 975 white-tailed deer (odocoileus virginianus) from 83 localities in 13 southeastern states were examined for nematodes. in order of prevalence, the following parasites were found: capillaria bovis, eucyathostomum webbi, monodontus louisianensis, nematodirus odocoilei, oesophagostomum venulosum, trichuris sp, cooperia punctata, trichostrongylus longispicularis, strongyloides sp, cooperia oncophora, cooperia spatulata, cooperia sp, and trichostro ... | 1976 | 977456 |
| [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 |
| 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 |
| the role of temperature and light on inhibition of development of cooperia oncophora. | infective cooperia oncophora larvae were temperature and light conditioned by holding them at various temperatures and daily light intensities for up to 56 days prior to administration to parasite-free calves via stomach tube. the calves were killed either on day 20 or day 21 postinfection. a marked (up to 80.5%) inhibition of development occurred in larvae held at 4 degrees c while little or no inhibition occurred in larvae held at room temperature or in fresh larvae. marked inhibition also occ ... | 1978 | 567519 |
| 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 |
| 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 |
| arrested development of ostertagia ostertagi and cooperia oncophora: effect of the time of year on the conditioning and deconditioning of infective larvae. | | 1978 | 621298 |
| experimental infections with cooperia oncophora (railliet, 1918) in calves. results of single infections with two graded dose levels of larvae. | two experiments were carried out in which calves reared parasite-free were infected with a single dose of 3rd-stage larvae of cooperia oncophora. in the first experiment the calves received 20 000 or 200 000 infective larvae and they were autopsied 28 or 56 days after the infection. in the second experiment the doses were the same but the animals were killed 14, 84 or 140 days after infection. if a dose of 20 000 was given, clinical signs were never observed, while at a dose level of 200 000 the ... | 1979 | 481910 |
| 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 |
| [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 |
| 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 |
| activity of oxfendazole against inhibited larvae of ostertagia ostertagi and cooperia oncophora. | | 1978 | 644827 |
| helminth parasites of bighorn sheep in oregon. | the lungs and gastrointestinal tracts from 18 hunter-killed bighorn rams (ovis canadensis californiana) were examined in total or in part for helminth parasites during a two-year study of three separate herds in eastern oregon. prevalence was 100% with the lungworm protostrongylus stilesi. the gastrointestinal fauna from 11 rams comprised cooperia oncophora, marshallagia marshalli, nematodirus oiratianus, oesophagostomum spp., ostertagia occidentalis, o. ostertagi, skrjabinema ovis, trichostrong ... | 1977 | 864844 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| the effect of mixed grazing of sheep and cattle on worm burdens in lambs. | lambs from ewes grazed without cattle at 4.9, 7.4 and 9.9 ewes and lambs per hectare and from ewes run with steers at an equivalent median stocking rate at four ratios in which sheep comprised 30%, 40%, 50% and 70% of the animal equivalents were killed and examined for worms. when sheep grazed alone, there was no significant increase in the number of worm species normally found in sheep, namely ostertagia circumcincta and nematodirus spathiger, with an increase in stocking rate. when sheep graze ... | 1975 | 1200936 |
| 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 |
| 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 |
| 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 |
| moxidectin: systemic activity against common cattle grubs (hypoderma lineatum) (diptera: oestridae) and trichostrongyle nematodes in cattle. | moxidectin, a systemic insecticide, was evaluated for its efficacy against the migrating first instars of the common cattle grub, hypoderma lineatum, and against nematode egg production in beef cattle. it was observed that all three levels (0.1, 0.2 and 0.4 mg moxidectin kg-1) were 100% effective against cattle grubs when administered as a s.c. injection. the same levels of treatment were very effective (90-100%) in reducing trichostrongyle nematode egg production. however, there was a slight in ... | 1992 | 1502783 |
| experimental infections with cooperia oncophora in calves. a study with two different larval dose levels and dosing regimens. | the effect of different larval dose level and dosing regimens on the course of cooperia oncophora infection in calves was studied. four groups each of 4 calves were experimentally infected either with 50,000 or 200,000 c. oncophora larvae (l3) given either as single infections or as daily trickle infections. an additional group of calves remained as uninfected controls. the animals were necropsied on week 4 after infection. mild to moderate clinical signs of parasitic gastroenteritis developed a ... | 1992 | 1442370 |
| preliminary observations on naturally acquired hypobiotic cooperia oncophora infections in cattle. | | 1992 | 1488955 |
| ability of the fungus pleurotus pulmonarius to immobilise preparasitic nematode larvae. | in vitro experiments showed that the oyster mushroom pleurotus pulmonarius exerts a strong immobilising effect on preinfective larvae of the animal parasitic nematodes ostertagia ostertagi, cooperia oncophora, oesophagostomum quadrispinulatum and cyathostoma species. infective stages of the same species seemed less vulnerable to fungal attack, possibly because they are protected by their outer cuticle. | 1991 | 1780575 |
| effect of sustained release and pulse release anthelmintic intraruminal devices on development of pathophysiological changes and parasite populations in calves infected with ostertagia ostertagi and cooperia oncophora. | an experiment was conducted in calves to investigate the effect of sustained release and pulse release anthelmintic intraruminal boli on the development of pathophysiological changes following daily infection with ostertagia ostertagi and cooperia oncophora for six weeks. after infection various pathophysiological changes were detected including increases in serum pepsinogen concentration, enteric plasma protein losses and in the catabolic rate of albumin. such changes developed rapidly in the u ... | 1991 | 1788487 |
| effects of tactical late-season treatments with ivermectin on calves naturally exposed to trichostrongyles. | this study was conducted to evaluate the effects of tactical treatments with ivermectin against trichostrongyles in first-season grazing heifer calves in the danish marshland. a group of black-pied friesian calves was turned out in early may on a permanent pasture naturally infected with trichostrongyle larvae. in late july, when high herbage infectivity started to appear, the pasture was divided into two plots of equal size, which from then and until housing in late october were each grazed by ... | 1990 | 2251746 |
| identification and isolation of a specific antigen with diagnostic potential from dictyocaulus viviparus. | the purpose of the investigation was to isolate and identify a specific antigen of dictyocaulus viviparus that can be used to diagnose lungworm infections in cattle. somatic, excretion and secretion antigens of adult d. viviparus and somatic antigens of l3 larvae were examined in an indirect enzyme-linked immunosorbent assay (elisa) to determine whether they cross-reacted with sera collected from calves with mono-infections of fasciola hepatica. ostertagia ostertagi, ascaris suum, or cooperia on ... | 1991 | 1832795 |
| increased establishment of lungworms (dictyocaulus viviparus) in calves after previous infections with gastrointestinal nematodes (ostertagia ostertagi and cooperia oncophora). | the influence of a priming infection with gastrointestinal nematodes on the subsequent establishment of lungworms was studied. repeated inoculations of calves with ostertagia ostertagi and cooperia oncophora during 3, 5 or 7 weeks resulted in an establishment of lungworms that was 191% of the establishment found in naïve controls. the higher take was associated with a higher faecal output of lungworm larvae and with lower weight gains of calves. the effect was not significantly influenced by the ... | 1989 | 2529698 |
| [the helminth fauna of the gastrointestinal tract of young cattle in northwest germany]. | ten unmedicated animals of a controlled anthelmintic trial were used to analyse the present gastrointestinal helminth fauna of young cattle from the northwest of germany. this survey done in august revealed ostertagia ostertagi to represent the most prevalent and abundant species followed by cooperia oncophora and nematodirus helvetianus. o. lyrata, o. leptospicularis, c. zurnabada, c. punctata, trichostrongylus axei, haemonchus contortus, bunostomum phlebotomum, capillaria bovis and trichuris d ... | 1989 | 2598802 |
| visualization of eosinophil chemotactic factor in abomasal tissue of cattle by immunoperoxidase staining during ostertagia ostertagi infection. | eosinophil chemotactic factor (ecf) was localized predominantly in the intestinal cells and lateral hypodermal cords of developing fifth stage larvae (l5) of ostertagia ostertagi within abomasal tissue cross-sections by peroxidase in an antibody sandwich technique using monoclonal antibody to ecf. cooperia oncophora larvae in tissue cross-sections did not stain using this technique. these experiments demonstrate that ecf is localized in ostertagia ostertagi organelles and is probably released by ... | 1989 | 2658300 |
| an assessment of residual ovine nematodes on pasture under maritime conditions. | residual ovine nematode pasture infections were assessed by grazing groups of ewes and their lambs on permanent sheep and cattle pastures and by the use of tracer lambs. ostertagia spp., cooperia oncophora, nematodirus spp., chabertia ovina and trichuris spp. eggs and/or larvae survived on pastures overwinter. second generation ostertagia larvae were present in greatest numbers on pasture during the latter part of august and early september. the failure of a significant build-up of cooperia onco ... | 1989 | 2766155 |
| delayed resumption of development of inhibited cooperia oncophora in a yearling calf. | during a study of larval inhibition, resumption of development of cooperia oncophora was observed in one calf to occur over a prolonged period of time. this animal had grazed for 14 weeks, was treated with thiabendazole and stabled for eight weeks prior to grazing the same pasture for ten days in late fall. a marked increase in cooperia egg output started about six months after restabling. worm egg outputs persisted for about 14 months with counts of up to 1000 eggs per gram during the first eig ... | 1989 | 2914219 |
| age resistance in calves to ostertagia ostertagi and cooperia oncophora. | calves were infected repeatedly during a period of 6 weeks with ostertagia ostertagi and cooperia oncophora, at an age of 3, 6 or 9 months. the inoculations were performed during three periods, february-march, may-june and august-september, to account for possible seasonal effects or effects of larval batches. observations were done on faecal egg output, antibody titres and weight gains. calves were slaughtered for post mortem examinations 9 weeks after the start of infections. the influence of ... | 1991 | 1897112 |
| increased establishment of lungworms after exposure to a combined infection of ostertagia ostertagi and cooperia oncophora. | three-month-old calves were infected three times weekly during a 5-week period with cooperia oncophora, ostertagia ostertagi or a combination of these two species. for each type of infection two dose levels were applied. in addition one group of calves was kept uninfected. after removal of the primary infection by anthelmintic treatment all calves were challenged with lungworm larvae and slaughtered 5 weeks later. the groups receiving either c. oncophora or o. ostertagi as a monospecific infecti ... | 1990 | 2143329 |
| preliminary report: immunodiagnosis of pre-type ii ostertagiasis. | ostertagia ostertagi soluble antigens were prepared by gel electrophoresis and electrophoretic transfer onto nitrocellulose for enzyme-linked immunosorbent assays with serum probes. serologic responses to l3-derived antigen of approximately 32 kda may be unique and diagnostic for cattle harboring inhibited larvae, or pre-type ii ostertagiasis. specificity was evaluated by comparing sera from pre-type ii cattle to sera from type i, uninfected, fascioloides magna infected, fasciola hepatica infect ... | 1988 | 3363842 |
| 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 |
| field experiment on the ability of earthworms (lumbricidae) to reduce the transmission of infective larvae of cooperia oncophora (trichostrongylidae) from cow pats to grass. | in denmark earthworms play an important role in the disappearance of cow pats on pastures. field investigations were designed to study the influence of earthworms on the transmission of infective cooperia oncophora larvae from experimental cow pats to grass. results from the present experiment showed that cow pats, protected from attack by earthworms, disappeared at a much lower rate than unprotected cow pats. development in faeces and transmission to grass of c. oncophora larvae were disturbed ... | 1987 | 3437351 |
| efficacy of morantel sustained release bolus against gastrointestinal nematodes in first season grazing holstein calves. | the efficacy of the morantel sustained release bolus (msrb) in reducing gastrointestinal parasitism in first season grazing calves was evaluated during the summer--autumn grazing seasons of 1982 and 1983 in western oregon. each of 38 calves (1982) and 40 calves (1983) were randomly assigned to either control or treatment groups which were given msrb on the day of turnout onto pasture. mean worm burdens from tracer calves grazed with treated animals in 1982 and 1983 showed overall reductions of 8 ... | 1987 | 3564351 |
| field experiments on the ability of arthrobotrys oligospora (hyphomycetales) to reduce the number of larvae of cooperia oncophora (trichostrongylidae) in cow pats and surrounding grass. | in field experiments, conducted on parasite-free grass plots in two consecutive summers, artificially prepared cow pats containing cooperia oncophora eggs were inoculated with the nematode-trapping fungus arthrobotrys oligospora. numbers of infective c. oncophora larvae isolated from the pats as well as from the surrounding herbage were subject to an approximately ten-fold reduction as compared with numbers in fungus-free pats and herbage surrounding these. this reduction was undoubtedly a resul ... | 1987 | 3571923 |
| the influence of weather and egg contamination on the development of third-stage larvae of cooperia oncophora on pasture. | the influence of weather and egg contamination on the dynamics of herbage contamination with infective larave of cooperia oncophora was investigated on artificially contaminated grass plots and in a grazing experiment with 24 first-year grazing calves from may to october 1987 in lower saxony, germany. on the experimental plots the larval translation was highest at the beginning of july and in the second part of september, following high mean weekly temperatures. between july and september peak r ... | 1992 | 1428505 |
| interactions between the predacious fungus arthrobotrys oligospora and third-stage larvae of a series of animal-parasitic nematodes. | interactions between the predacious hyphomycete arthrobotrys oligospora and third-stage larvae of nine animal-parasitic nematodes were tested in vitro. the trap-inducing capabilities of the ruminant trichostrongylus cooperia oncophora, c. curticei, haemonchus contortus and ostertagia ostertagi and of equine cyathostomes were almost comparable to those of free-living soil nematodes, and significantly higher than those of the porcine oesophagostomum dentatum and oe. quadrispinulatum and of the mur ... | 1988 | 3347992 |
| seasonal prevalence of gastrointestinal nematodes of beef calves grazed on irrigated pastures in the lower sacramento valley of california. | two worm-free calves were allowed to graze on irrigated pasture with a naturally infected herd for each of 34 one-month periods from november 1979 to august 1982. after each grazing period, the calves were transferred to a cement-floored pen for 3 weeks and then were euthanatized and necropsied. ostertagia ostertagi and cooperia oncophora were the most prevalent species of nematodes recovered. adults and larvae of ostertagia spp and cooperia spp were most numerous in winter and spring and least ... | 1988 | 3377319 |
| [effects of various disinfectants on the development and survival possibilities of the pre-parasitic stages of ostertagia ostertagi, cooperia oncophora and ascaris suum]. | eleven disinfectants varying in chemical composition and containing active chlorine, phenol, cresol, sodium or potassium hydroxide, quaternary ammonium compounds, glutaraldehydes or paraformaldehyde were tested for their lethal effect on eggs and infective larvae of ostertagia ostertagi and cooperia oncophora and non-embryonated and embryonated eggs of ascaris suum. suspensions of all tested stages were mixed with the disinfectants in the concentrations recommended by the manufacturer and with d ... | 1987 | 3617021 |
| dynamics of ostertagia spp. and cooperia oncophora in field-grazed cattle from weaning to 2 years old in new zealand, with particular reference to arrested development. | gastrointestinal nematode parasite burdens were monitored in a herd of field-grazed cattle from weaning to 2 years old to allow observations to be made on the dynamics of burdens of arrested ostertagia spp. and cooperia oncophora. arrested ostertagia spp. accumulated in the herd over their first autumn and winter to reach a peak in late winter/spring (august-october). from october until late january they declined at a rate comparable to that at which they had accumulated. numbers continued to de ... | 1987 | 3590607 |
| the comparative efficacy of oxfendazole administered as bolus and suspension to naturally infected sheep in greece. | in a flock of 20 ewes naturally infected with those parasites of sheep most common in greece, and kept indoors during the whole trial, oxfendazole at the dose rate of approximately 2.9 and 2.8 mg/kg body-weight was tested as a 4 g bolus containing 112 mg active ingredient and a 2.265% suspension. the evaluation of its efficacy was based on the necropsy findings which were also supported by faecal egg counts. no differences in efficacy were noticed between the two formulations of the drug. both b ... | 1986 | 3745877 |
| the sequential development of type i and type ii ostertagiasis in young cattle with special reference to biochemical and serological changes. | the sequential development of type i and type ii ostertagiasis over a 2-year period in the same naturally infected cattle is described for the first time. particular reference is made to biochemical and serological changes. positive relationships were demonstrated between the clinical signs of both type i and type ii disease, and marked increases in the levels of plasma pepsinogen, plasma gastrin and antibody titres to adult ostertagia antigen. at necropsy, there were significant relationships b ... | 1986 | 3750807 |
| strains of cattle parasites in the netherlands with different propensities for inhibited development. | a field study was undertaken of the possible differences in propensity for inhibited development in strains of cattle nematodes from two different locations in the netherlands. in one location (lelystad) the strains were thought to lack the ability for inhibited development as a result of environmental stimuli on the infective larvae, while in the other location (utrecht) this ability was presumed to be present. the lelystad strains were kept at the original location and were also transferred to ... | 1987 | 3590614 |
| pathophysiological and parasitological studies on cooperia oncophora infections in calves. | calves which had received daily infections of cooperia oncophora over a six week period showed inappetence, weight loss, impaired nitrogen retention and a loss of plasma proteins into the gut. during this period the infections occurred in the duodenum, jejunum and ileum and many larval stages were present in the mucosa of the small intestine. at necropsy, on weeks 3, 6 and 10 after the first infection, stunting and thickening of the villi were noted with excessive mucus production. prior adminis ... | 1987 | 3616151 |
| efficacy of ivermectin in a topical formulation against induced gastrointestinal and pulmonary nematode infections, and naturally acquired grubs and lice in cattle. | efficacy of ivermectin in a topical formulation was evaluated in cattle against adult gastrointestinal and pulmonary nematode infections (experiment 1, n = 24), the 2nd- and 3rd-stage larvae of hypoderma spp (experiment 2, n = 12), and the biting louse damalinia bovis (experiment 3, n = 12). nematode infections were induced and grubs and lice were naturally acquired. treatments consisted of a single dose of ivermectin in a topical formulation of 200, 500, or 1,000 micrograms/kg of body weight in ... | 1986 | 3789500 |
| maximum-likelihood estimates of the mortality and migration rates of the infective larvae of ostertagia ostertagi and cooperia oncophora. | we present an analysis of the survival and migration rates of the infective (l3) stages of ostertagia ostertagi and cooperia oncophora. although the majority of laboratory studies show that the survival of the l3 stage depends upon temperature, moisture and the age of the larvae, a simple mathematical model of larval demography, in which their mortality and migration rates are held constant, provides as good agreement between observed and predicted larval counts as models in which these rate pro ... | 1986 | 3737245 |
| pathophysiological and parasitological studies on a concurrent infection of ostertagia ostertagi and cooperia oncophora in calves. | calves which had received daily concurrent infections of 2000 ostertagia ostertagi and 10,000 cooperia oncophora infective larvae over a 42-day period displayed a range of clinical signs typical of acute parasitic gastroenteritis including inappetence, weight loss, hypoalbuminaemia and diarrhoea. there were consistent and significant depressions in both digestive efficiency and nitrogen retention. radioisotopic studies revealed marked disturbances in protein metabolism which were associated with ... | 1990 | 2333427 |
| the residual effect of treatment with ivermectin after experimental reinfection with nematodes in calves. | the residual effect of treatment with ivermectin after experimental reinfection in calves was tested. twenty-four calves were divided into 6 groups of 4 calves each. all calves received a primary infection of 50,000 larvae of both ostertagia ostertagi and cooperia oncophora and 1000 dictyocaulus viviparus larvae. calves of group 1 remained untreated, and all other calves were treated 21 days after primary infection (0.2 mg/kg injected subcutaneously). calves of groups 1 and 2 were slaughtered 7 ... | 1986 | 2941914 |
| trichostrongyle larval populations on herbage from grazed and ungrazed cattle pastures in south west scotland. | in the course of studies on the control of bovine parasitic gastroenteritis in south west scotland using a morantel sustained release bolus the populations of trichostrongyle infective larvae on herbage were monitored over a two-year period. from the results of the herbage analysis and the worm burdens in parasite naive tracer calves introduced at the end of 18 months, it was clear that considerable numbers of infective larvae of ostertagia ostertagi and cooperia oncophora survived for at least ... | 1985 | 4035086 |
| serological studies of parasitized cattle. i. complement--fixing activity of serial serum samples. | complement-fixation (cf) tests with sonicated aqueous extracts of adult forms of five species of gastrointestinal nematodes as antigens have been made on serial biweekly bleedings from two groups of parasitized calves grazing on infected pastures during the 1963 or 1964 seasons. three of these nematode species, cooperia oncophora, ostertagia ostertagi and nematodirus helvetianus, were found in large numbers in most of these animals. the calves were negative serologically before being placed on p ... | 1966 | 4226342 |
| a comparison of two methods and two additives for faecal cultivation of bovine trichostrongyle larvae. | the larval recovery rates of ostertagia ostertagi and cooperia oncophora from monospecific copro-cultures were determined by the methods of corticelli and lai, and henriksen and korsholm using vermiculite or polystyrene pellets as inert additives. the addition of either vermiculite or polystyrene pellets in the two culture methods significantly (p less than 0.05) improved larval recoveries of both parasite species. recovery rates with the henriksen and korsholm method were higher (p less than 0. ... | 1989 | 2763446 |
| the anthelmintic activity of cambendazole in calves and lambs. | tests were carried out on the efficacy of cambendazole (5-isopropoxy carbonylamino-2-(4-thiazolyl) benzimidazole) against lungworm and gastrointestinal parasites of calves and lambs. against dictyocaulus viviparus the compound was highly effective (80%) against mature worms at levels of 35 mg/kg and over and immature "arrested" worms at 60 mg/kg (71% efective). in the calves the compound was very effective (90 to 99%) against adult haemonchus placei, ostertagia spp., trichostrongylus axei and co ... | 1972 | 4259923 |
| interactions between lungworms and gastrointestinal worms in calves. | interactions between gastrointestinal worms (ostertagia ostertagi, cooperia oncophora) and lungworms (dictyocaulus viviparus) in calves were studied by assessing the effect of primary infections with either group of worms on the development of homologous or heterologous challenge infections. primary infections with lungworms resulted in some degree of resistance to challenge with gastrointestinal worms, but this resistance was lower than that found after homologous infection. primary infections ... | 1988 | 2964752 |
| persistent anthelmintic activity of ivermectin in cattle. | two studies are described which demonstrate the persistent activity of ivermectin injected subcutaneously into cattle at 200 micrograms/kg in preventing the establishment of induced infections with the gastrointestinal parasites ostertagia ostertagi and cooperia oncophora and the lungworm dictyocaulus viviparus. these results indicated a reduction in mean worm count compared with the control group for o ostertagi of more than 99, 45 and 94 per cent with a seven, 14 or 21 day interval between tre ... | 1985 | 3157261 |
| overwintering of bovine gastrointestinal nematodes in southwestern ontario. | several steers, reared in isolation until approximately six months of age, were placed on a small isolated enclosed pasture from late spring to late fall of 1970, 1971 and 1972. the pasture was left vacant and unused during the winters and early springs. the pasture had been used in previous years by cattle, and in the late spring of 1970 was grazed by cattle know to be passing gastrointestinal nematode eggs in their feces. the steers were slaughtered periodically, and the prevalence of nematode ... | 1974 | 4272963 |
| the development, clinical signs and economic losses of gastrointestinal parasitism in feeder cattle on irrigated and non-irrigated dikeland and upland pastures. | investigations were carried out over three grazing seasons with parasitized and treated (control) steers on irrigated and non-irrigated upland and dikeland pastures. the stocking rate in each paddock was adjusted by either adding or removing animals so as to maintain as uniform a sward and rate of grazing as possible. animals were weighed on and off the pastures and fortnightly during the grazing seasons. during the first grazing season clinically normal steers shedding low numbers of gastrointe ... | 1972 | 4263919 |
| on the persistence of infective ostertagia ostertagi, cooperia oncophora and nematodirus helvetianus on pastures. | by grazing parasite-free susceptible calves on naturally infected paddocks for eighteen day periods, nematodirus helvetianus was shown to survive over two winters on marshland pastures under maritime climatic conditions in three successive years although the numbers surviving the second winter in two of the three years were low. climatic conditions of below normal temperatures and little snowfall would appear to have a detrimental effect on the survival of nematodirus over a second winter althou ... | 1972 | 4263911 |
| on the natural seeding of marshland pastures with bovine gastrointestinal parasites. | by placing parasite-free calves in paddocks grazed by infected animals for 18 day periods at various times during the previous season it was shown that eggs of ostertagia ostertagi, cooperia oncophora and nematodirus helvetianus deposited on pastures from early july to october of one year were able to survive in the maritime area of canada over winter either as eggs and/or larvae and contribute to residual infections on these pastures the following spring. the greatest deposition and/or survival ... | 1974 | 4274825 |
| on the immunological response of young calves to light nematodirus helvetianus infection. | infecting parasite-free eight week old calves with 8,000 infective nematodirus helvetianus larvae did not modify appreciably their response to a later heavy field challenge with n. helvetianus, ostertagia ostertagi and cooperia oncophora, although two of six animals did have smaller nematodirus burdens. | 1973 | 4270440 |
| studies on the survival of eggs and infective larvae of ostertagia ostertagi and cooperia oncophora in herbage. | | 1974 | 4475530 |
| the effects of anthelmintic treatments on the development of gastrointestinal parasitism in calves. | fortnightly treatment of susceptible calves with 1-tetramisole during the first two months of continuous exposure to pastures residually heavily-infected with ostertagia ostertagi, cooperia oncophora and nematodirus helvetianus did not prevent the development of clinical parasitic gastroenteritis, although the infections were not as severe as in nontreated calves. development of resistance in treated calves was manifested by significantly smaller numbers of cooperia eggs in utero (which were ref ... | 1974 | 4274819 |
| the survival of infective larvae of ostertagia ostertagi and cooperia oncophora in hayloft-dried grass. | | 1974 | 4432682 |
| efficacy of cambendazole against naturally occurring nematodirus helvetianus and cooperia oncophora infections in calves. | | 1974 | 4429241 |
| studies on the influence of lime, formalin, formic acid, and ammonium persulphate on the eggs and larvae of ostertagia ostertagi and cooperia oncophora in liquid cattle manure. | | 1973 | 4798421 |
| studies on arrested development of ostertagia ostertagi and cooperia oncophora. | | 1974 | 4478097 |
| the survival of eggs and infective larvae of ostertagia ostertagi and cooperia oncophora in solid cattle manure and urine. | | 1974 | 4478790 |
| inhibited development of ostertagia ostertagi, cooperia oncophora, and nematodirus helvetianus in parasite-free calves grazing fall pastures. | | 1974 | 4842852 |
| studies on the survival of infective larvae of ostertagia ostertagi and cooperia oncophora in silage grass containing formic acid. | | 1974 | 4844325 |
| the effects of age and previous infection on the development of gastrointestinal parasitism in cattle. | an age resistance in cattle to establishment of infection with cooperia oncophora was not demonstrated. cattle exposed to a heavy infection for the first time at approximately 15 months of age were as susceptible to establishment of infection as 3 to 4 month old calves, but stunting of worms and inhibition of ovulation did occur in the older animals, possibly due to a rapid development of resistance as a result of sensitization by a previous extremely light infection. an age resistance in cattle ... | 1968 | 4234780 |
| studies on the survival of eggs and infective larvae of ostertagia ostertagi and cooperia oncophora in liquid cattle manure. | | 1974 | 4858506 |
| on the development of gastrointestinal parasitism in bovine yearlings. | a comparative study on the development of osteragia ostertagi, cooperia oncophora and nematodirus helvetianus in 15-month-old yearlings and three-month-old calves demonstrated that yearlings have considerably greater resistance to gastrointestinal parasitism than calves. this was manifested by the establishment of smaller worm burdens, marked stunting of worms and a markedly lower worm egg output in the yearlings. the characteristic marked rise in egg counts observed in calves a few weeks after ... | 1970 | 4249092 |
| [biology and ecology of pre-parasitic development stages of ostertagia ostertagi and cooperia oncophora (nematoda, trichostrongylidae) in view of the epidemiology of trichostrongyloidiasis of cattle]. | | 1967 | 5631855 |
| [biology and ecology of the preparasitic development stages of ostertagia ostertagi and cooperia oncophora (nematoda, trichostrongyloidea) with reference to the epidemiology of cattle trichostrongyloidiasis]. | | 1967 | 5632511 |
| effects of the use of a morantel sustained release bolus in first and second year grazing cattle. | in an experiment carried out in 1981 and 1982, the effect of the use of a morantel sustained release bolus (paratect bolus) on the weight gain and a number of parasitological parameters of cattle was studied. in the first year 42 calves were divided into 3 equal groups, one group was kept outside and treated with a bolus (b), the second group was kept outside and was not treated (c), while the third group remained indoors (i). groups b and c were grazed separately on contaminated pasture. during ... | 1985 | 4049726 |
| studies on the bionomics of eggs and infective larvae of ostertagia ostertagi and cooperia oncophora in soil. | | 1974 | 4858507 |
| [experimental vaccination of calves with irradiated larvae of ostertagia ostertagi and cooperia oncophora]. | | 1969 | 5796074 |
| on the survival of overwintering bovine gastrointestinal nematode larvae during the subsequent grazing season. | large numbers of overwintering nematodirus helvetianus were shown to survive on maritime marshland pastures throughout the ensuing grazing season, while the numbers of ostertagia ostertagi and cooperia oncophora declined rapidly after the first few weeks. it was concluded that pastures carrying heavy overwintering residual infections, particularly of n. helvetianus, may be unsafe for susceptible cattle at any time during the following grazing season. | 1969 | 4237295 |
| critical trials on the efficacy of thiabendazole against ostertagia ostertagi, cooperia oncophora, and nematodirus helvetianus. | | 1968 | 5650475 |
| in vitro egg production of cooperia oncophora. | | 1968 | 5689169 |
| seasonal pattern in the strongyle egg output of adult dairy cows in the netherlands. | the strongyle egg output in a herd of dairy cows was studied from january 1980 until january 1981. egg output was measured as the number of larvae per g of faeces (lpg) and this was accompanied by larval differentiation. the most important findings were an increase in the total strongyle and the ostertagia lpg in june followed by a decrease later in the summer; a marked increase in the incidence and lpg of oesophagostomum from january to may followed by a decrease from july to october and a decr ... | 1982 | 7146630 |
| immunity and cross immunity to cooperia oncophora and cooperia pectinata in calves and lambs. | | 1965 | 5894727 |
| [efficacy of albendazole as a pellet formulation against ostertagia ostertagi and cooperia oncophora in experimentally infected calves]. | | 1984 | 6370654 |
| an epidemiological study of trichostrongylidiasis in dairy cattle grazing irrigated pastures. | trichostrongylid burdens in 1 to 2-year-old dairy heifers were estimated after they grazed with a dairy herd for up to 12 months. ostertagia ostertagi, trichostrongylus axei and cooperia oncophora represented 79.5, 12.7 and 7.8% respectively of all trichostrongylids recovered. the largest burden was 97,000 trichostrongyles with less than 20,000 being the typical burden. clinical disease was not observed. the strain of o. ostertagi present was capable of inhibition and was not necessarily control ... | 1984 | 6497788 |
| the possible role of slugs (agriolimax spp.) in the transmission of infective larvae of cooperia oncophora. | | 1984 | 6501856 |