Publications

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the toxic effect of phenothiazine on cattle of the gulf coastal plain area of texas, and its efficacy in removing ostertagia ostertagi and trichostrongylus axei. 195313031001
studies on trichostrongylosis. i. the pathogenesis of trichostrongylus axei in sheep maintained on a low plane of nutrition. 195413163245
studies on trichostrongylus axei. ii. the pathogenesis of t. axei in sheep maintained on a high plane of nutrition. 195413211864
the course of infection and pathogenic effect of trichostrongylus axei in calves. 195513238744
studies on trichostrongylus axei. iv. factors in the causation of pathogenic effects by t. axei. 195513263451
studies on trichostrongylus axei. iii. the course of untreated infestations. 195514367568
studies on trichostrongylus axei (cobbold, 1879). ii. some quantitative aspects of experimental infections in rabbits. 195713429440
the effect of experimental infection with ostertagia ostertagi and trichostrongylus axei in calves on weight gain, feed consumption, and feed utilization. 195813583360
studies on trichostrongylus axei (cobbold, 1879). iv. some aspects of treatment, pathogenicity, and quantification in experimental injections of a horse strain in calves. 195914415512
studies on trichostrongylus axei (cobbold, 1879). v. some quantitative and pathologic aspects of experimental infections with a horse strain in sheep. 196014415513
studies on trichostrongylus axei (cobbold, 1879). vi. total serum protein, blood and plasma volume, and electrophoretic serum fractionation in infected and uninfected lambs. 196014415514
the effect of green feed and ascorbic acid upon single experimental infections of trichostrongylus axei (cobbold, 1879) in the laboratory rabbit. 196014438449
some effects of x-ray on the infective larvae of the cattle nematode trichostrongylus axei. 196013810353
studies on trichostrongylus axei (cobbold, 1879). vii. some quantitative and pathologic aspects of natural and experimental infections in the horse. 196113760651
studies on bovine gastrointestinal parasites. xxv. duration of egg production of cooperia punctata, trichostrongylus axei, and oesophagostomum radiatum. 196213934153
studies on trichostrongylus axei (cobbold, 1879). viii. some quantitative aspects of experimental infection of the mongolian gerbil (meriones unguiculatus). 196314050237
serological and immunological responses of calves to infection with trichostrongylus axei. 196314050238
the effect of culture temperature and age on the infectivity of the larvae of trichostrongylus axei and t. colubriformis in rabbits and guinea pigs. 19665927217
survival of infective larvae of the cattle nematodes, cooperia punctata, trichostrongylus axei, and oesophagostomum radiatum. 19676068246
active immunity against trichostrongylus axei in sheep and rabbits. 19676068248
experimental infections of calves with trichostrongylus axei; the course and development of infection and lesions in low level infections. 19675342421
experimental infections of calves with trichostrongylus axei: observations on lethal infections. 19685692207
trichostrongylus axei (cobbold, 1879) in white-tailed deer. 19685757684
experimental infection of the african multimammate mastomys, rattus (mastomys) natalensis, with the minute stomach worm trichostrongylus axei. 19685757724
the effect on infectivity and pathogenicity of cross infection of trichostrongylus axei from sheep to cattle. 19695812845
experimental infection of lambs with trichostrongylus axei. 19695818032
experimental infections of calves with trichostrongylus axei investigations using abomasal cannulae. 19694896772
experimental infections of lambs with trichostrongylus axei; investigations using abomasal cannulae. 19694897845
serum pepsinogen concentrations in horses naturally infected with trichostrongylus axei. 19695389337
the effect of temperature on the development of the eggs and larvae of trichostrongylus axei. 19695394130
effects of cold storage on survival and infectivity of third-stage larvae of the stomach worm, trichostrongylus axei (cobbold, 1879). 19705413846
nutritional balance trials with lambs experimentally infected with trichostrongylus axei. 19705440610
nutritional balance trials with calves experimentally infected with trichostrongylus axei. 19705485194
investigations of acquired immunity to trichostrongylus axei infections in seven-month-old lambs. 19705492903
trichostrongylus axei host-parasite relationship studies. the influence of passage on cross infection. 19705498925
genetic differences in the susceptibility of sheep to infection with trichostrongylus axei. a comparison of scottish black-face and dorset breeds. 19705498926
investigations of the ability of strains of trichostrongylus axei to produce immunity in calves and sheep. 19705499323
the ultrastructural changes in the abomasal mucosa of calves experimentally infected with trichostrongylus axei. 19715550255
ultrastructural changes in the abomasal mucosa of lambs experimentally infected with trichostrongylus axei. 19715552698
trichostrongylus axei (cobbold, 1879) and t. colubriformis (giles, 1892) ransom 1911: relationship of larval infectivity to time of patent infections in sheep. 19715133898
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 ...19724259923
anthelmintic activity of levamisole against nematodirus spathiger and trichostrongylus axei in sheep. 19725036315
the action of six anthelmintics against trichostrongylus axei in lambs. 19725074110
predatory activity of nematode trapping fungi against the larvae of trichostrongylus axei and ostertagia ostertagi: a possible method of biological control. 19734735716
a controlled test of the action of thiabendazole against trichostrongylus axei. 19734777763
abomasal nematodes in cattle in ontario.during 1970, 93 abomasa from cattle in ontario were examined, and from 63 of these abomasa nematode species of the genera ostertagia, haemonchus and/or trichostrongylus axei were recovered. the abomasa were from cattle six months to two years of age and were collected either from the postmortem room at the ontario veterinary college or from two abattoirs near guelph. the numbers of worms per abomasum were estimated and their genera were identified from a one-twentieth volume of the washings and ...19744272952
studies on haemonchus contortus. i. the influence of previous exposure to trichostrongylus axei on infestation with h. contortus. 19744469831
the incidence of strongyle nematodes in sheep viscera received at animal health laboratories in new zealand. 1. the abomasal parasites ostertagia spp. and trichostrongylus axei. 19744528038
egg output by trichostrongylus axei in sheep given a single infection. 19751141467
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 ...19751153893
[course of the parasite phase of development of trichostrongylus axei (cobbold, 1879) railliet et henry, 1909, in the domestic rabbit].rabbits of the new zealand white and small chinchilla breeds were each infected at 3-4 months of age with 4-10 thousand invasive trichostrongyle larvae. prepatent period of the infection was 22-32 days. third-stage larvae were present up to the 6th day of infection, fourth-stage from the 8th day, fifth-stage from the 14th day and sexually mature trichostrongyles on the 18th day. the period of patency of the infection lasted for over a year, but only small numbers of eggs were passed in faeces, a ...19751200742
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 ...19751200936
helminth parasitisms among intermingling insular populations of white-tailed deer, feral cattle, and feral swine.helminth infections among free-ranging, intermingling populations of white-tailed deer (odocoileus virginianus), cattle (bos taurus), and swine (sus scrofa) on an island off the georgia coast were studied. of 39 species of helminths collected, 19 were found in deer, 17 in cattle, and 13 in swine. of 28 species of helminths recovered from ruminants, 8, viz, capillaria bovis, cooperia punctata, dictyocaulus viviparus, gongylonema pulchrum, g verrucosum, haemonchus contortus, moniezia benedeni, and ...1975123523
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, ...1975123711
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 ...1975125055
[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 ...1976820034
the efficacy of thiabendazole against the arrested larvae of some trichostrongylidae and chabertia ovina in sheep.the activity of thiabendazole at 100 mg/kg was tested against the arrested larvae of ostertagia spp, haemonchus contortus, trichostrongylus axei, nematodirus spp and chabertia ovina in natural infections, in 10-month-old lambs. the result, assessed by means of worm counts, showed the treatment to be very effective.19761257622
critical tests with oxibendazole against gastrointestinal parasites of ponies.twenty ponies were allotted to 4 groups of 5 ponies each, and oxibendazole was orally administered at dose levels of 5, 10, 15, and 20 mg/kg. in the 3 groups of ponies given the largest doses, efficacy against 3 species of strongylus was between 92 and 100% and that against small strongylids of the genera cyathostomum, cylicocyclus, cylicodontophorus, and cylicostephanus was more than 99%. all adults and 95 to 100% of larvae of the pinworm oxyuris equi were removed. in the group of ponies given ...19761267243
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 ...1976999077
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 ...1977566412
controlled trials of the anthelmintic oxfendazole in ewes and lambs naturally infected with gastrointestinal nematodes.oxfendazole doses at a rate of 5 mg per kg, before or after lambing, reduced nematode egg output to insignificant levels in ewes, most of which were not exposed to re-infection. ewes treated with oxfendazole had a significantly lower egg output than those treated with levamisole, although the latter anthelmintic was also highly effective. in lambs, oxfendazole at a dose rate of 5 mg per kg, showed 100 per cent efficacy for ostertagia circumcincta, o trifurcata, teledorsagia davtiani, trichostron ...1977335633
evaluation of less than recommended dosages of levamisole phosphate for the treatment of gastrointestinal nematodes of cattle.the anthelmintic activity of 3 dosages of injectable levamisole phosphate was evaluated in 84- to 145-kg calves from a herd of cattle with a history of heavy gastrointestinal nematode infections. trichostrongylid egg counts in the calves varied from 450 to 700/g of feces. the anthelmintic was administered subcutaneously to 3 groups of 10 calves each, at the rate of 8 mg/kg of body weight (current manufacturer's recommendation), 6 mg/kg, and 4 mg/kg. a 4th group of 10 calves was utilized as untre ...1977833031
an evaluation of ethyl-6-ethoxybenzothiazole-2-carbamate (sch 18099) for anthelmintic activity in domestic animals.ethyl-6-ethoxybenzothiazole-2-carbamate (sch 18099) was evaluated for efficacy against natural helminth infections in ponies, pigs, lambs and chickens. sixteen critical trials were conducted in ponies at dosages of 15 to 150 mg/kg. at 15 mg/kg, efficacy against adult and larval oxyuris equi was 100% and 91% and against small strongyles it was 98%. efficacy levels were 95% against strongylus vulgaris and s. edentatus at the 20 mg/kg dosage. in two trials at 100 mg/kg efficacy against parascaris e ...1977864223
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 ...1977864844
critical anthelmintic trials in ponies with four benzimidazoles: mebendazole, cambendazole, fenbendazole, and albendazole.the comparative efficacy of four benzimidazoles against gastrointestinal parasites of ponies was evaluated by the critical test method. mebendazole (8.8 mg/kg), cambendazole (20 mg/kg), fenbendazole (5 mg/kg), and albendazole (2.5 and 5 mg/kg) given in single oral doses were highly effective against adult large strongylids (strongylus vulgaris, s. endentatus, s. equinus) and adult small strongylids (genera identified in order of frequency: cylicostephanus, cylicocyclus, cyathostomum, triodontoph ...1977886410
anthelmintic efficiency of oxfendazole in california lambs.oxfendazole, methyl 5(6)-phenylsulfinyl-2-benzimidazole carbamate, was given by oral drench (5 mg/kg) to california lambs harboring natural infections of gastrointestinal nematodes. ninety-nine percent of adult ostertagia circumcincta, ostertagia trifurcata, trichostrongylus axei, trichostrongylus vitrinus, trichostrongylus colubriformis, nematodirus filicollis, and nematodirus spathiger were removed by the anthelmintic.1977921025
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 ...1977921039
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 ...1977145816
[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 ...1977572958
the effect of dermally applied levamisole against the parasitic nematodes of cattle.a series of trials to establish the anthelmintic efficiency of levamisole, when applied dermally to calves, is described. the levamisole base was formulated in a suitable solvent system at 100 g/l and applied dermally at a dose rate of 8 mg base/kg. this gave efficiencies of 97.1-100%, 88.5-100%, 100%, 98.7-100% and 89.2-100% against adult haemonchus placei, ostertagia spp, cooperia spp, oesophagostomum radiatum and trichostrongylus axei, respectively. activity against the immature stages of h. ...1977588176
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 ...1977614021
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 ...1978677528
parasites of domestic and wild animals in south africa. ix. helminths in blesbok.four blesbok culled in the rietvlei nature reserve during may 1972 were each infested with trichostrongylus axei and impalaia nudicollis. some of these animals also harboured haemonchus bedfordi, haemonchus contortus, trichostrongylus falculatus, skrjabinema alata and avitellina centripunctata. thirty-two blesbok were culled in pairs at approximately 4-5 week-intervals in the percy fyfe nature reserve from july 1972 to november 1973. adult h. contortus were recovered in fair numbers from buck sl ...1978714392
the ecology of the free-living stages of trichostrongylus axei. 1978748218
[natural development of gastrointestinal helminthiasis in calves born during the dry season in guaira, state of são paulo, brazil].proceeding with their observations on bovine nematode epidemiology in guaíra, state of são paulo, the authors carried a study on the natural development of nematode infections in crossbred calves born at the dry season. the fecal nematode egg counts per gram (e.p.g.) performed every fortnight were positive at the start, in october, when calves were two months old, and reached the peak when they were five months old; cultures of faeces revealed larvae of cooperia, haemoncus, oesophagostomum and t ...1978754678
an evaluation of the efficacy of oxfendazole against the common nematode parasites of the horse.in a controlled trial in naturally-infected young ponies, oxfendazole administered orally at dose-rates of 10 mg per kg and 50 mg per kg resulted in complete elimination of trichostrongylus axei, parascaris equorum, oxyuris equi and adult strongylus vulgaris. also, all migrating strongylus edentatus larvae recovered from the subperitoneal tissues of the flank were found to be dead. minimum efficiencies of 99.8 per cent and 99.1 per cent were obtained against adult small strongyles (trichonema sp ...1978364817
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 ...1978567947
in vitro development of trichostrongylus axei, from infective larvae to young adults.advanced stages of trichostrongylus axei were grown from exsheathed infective larvae in roller culture systems consisting of a complex cell-free medium, api-6, when used alone or supplemented for 8- or 21-day intervals with pepsin or reducing agents, or both. young adult males and females were the most advanced stages attained. this stage was attained by days 18--21, when medium api-6 contained pepsin for 8 or 21 days, with or without reducing agents for the first 8 days; and by days 24--26, whe ...1979376816
[presence of trichostrongylus axei (cobbold, 1879) raillet et henry, 1909, in cattle in cuba].the first finding of trichostrongylus axei (cobbold, 1879) railliet et henry, 1909 in the cuban bovine cattle is reported. its characteristics are described and measurements obtained by authors are compared to those from others. fifty animals were examined and a 94% invasion was found.1979382284
[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 ...1979453633
parasites of domestic and wild animals in south africa. xii. artificial transmission of nematodes from blesbok and impala to sheep, goats and cattle.sheep were successfully infested artificially with the larvae of haemonchus contortus, trichostrongylus axei, trichostrongylus falculatus and impalaja nudicollis, cultured from the faeces of blesbok naturally infested with these nematodes. haemonchus placei, longistrongylus sabie, trichostrongylus colubrifomis, t. falculatus, impalaia tuberculata and cooperia hungi likewise became established in sheep, goats and calves dosed with larvae cultured from the faeces of infested impala. sheep and goat ...1979460820
oxfendazole--anthelmintic activity in egyptian goats artificially infected with gastrointestinal nematodes.the recently developed benzimidazole anthelmintic, oxfendazole, was tested against artificial nematode infestations in egyptian goats using oral dosing at 4.5 and 2.8 mg/kg. a 100% clearance of mature and immature haemonchus contortus, trichostrongylus axei, ostertagia circumcincta, coopera curticei, bunostomum trigonocephalum and chabertia ovina was obtained at the 4.5 mg/kg level. very high levels of clearance against the mature worms were obtained at 2.8 mg/kg but the drug was less effective ...1979462559
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 ...1979464563
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 ...1979464935
investigations of 'transfer factor' activity in the transfer of immunity to trichostrongylus axei infections in sheep.three investigations are described in which non-dialysed and dialysed leucocyte lysates, 'transfer factor' prepared from the blood of sheep infected with trichostrongylus axei successfully transferred immunity to challenge infection with that parasite in susceptible lambs. similar leucocyte lysates from parasite-free lambs failed to transfer a similar resistance to challenge infection. 'transfer factor' treatment produced a 30--72 per cent reduction in a total worm burden compared to susceptible ...1979472488
infection and immune kinetics of trichostrongylus axei in calves.in one experiment, 21 calves were given daily oral immunizing inoculations of 1,000 infective larvae (l3) of trichostrongylus axei, an abomasal nematode parasites, for 35 weeks. calves were euthanatized in groups of three every 5 weeks to determine infection kinetics. worm populations steadily increased through week 30, but the percentage of total inoculum that became established was about the same through week 30. at week 35, the number of worms dropped markedly. in a second experiment, 27 calv ...1979475128
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 ...1979494213
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 ...1979500427
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.1979525900
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 ...1979525922
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 ...1979533489
studies on haemonchus contortus. ii. the effect of abomasal nematodes on subsequent challenge with h. contortus.fifty-thousand infective larvae of trichostrongylus axei dosed to 7-9-month-old merinos protected them against a subsequent challenge with 50 000 infective larvae of haemonchus contortus. protection varied with the period between an initial dosage of t. axei and challenge with h. contortus as follows: after 90 days it was more than 80% effective in more than 80% of sheep; at 119 and 180 days there was still a significant reduction in the numbers of h. contortus recovered (p < 0,05 and p < 0,001, ...1979551369
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 ...1979157257
efficacy of oxfendazole against natural infestations of nematodes and cestodes in sheep in egypt.oxfendazole liquid suspension (systamex; wellcome) was administered orally at the dose of 4.5 mg per kg to 800 indigenous egyptian sheep clinically affected with dictyocaulus filaria, moniezia expansa, haemonchus contortus, ostertagia circumcincta, nematodirus spp, trichostrongylus axei, cooperia curticei, trichuris ovis and oesophagostomum spp. a 100 per cent clearance was recorded for all parasites with the exception of t ovis which were markedly reduced in number.1979157586
field observations on the epidemiology of abomasal parasites in young sheep during winter and spring.a flock of spring born lambs was continuously exposed to natural parasite infection from birth until selected for slaughter in groups of two or three, at monthly intervals throughout winter and spring for abomasal worm counts. meteorological data were recorded and regular estimates of infective pasture larval availability were made. parasite population changes and inhibition patterns for ostertagia spp, haemonchus contortus and trichostrongylus axei were recorded. ostertagia spp were found to su ...1979262603
the activity of albendazole against adult and larval gastrointestinal nematodes in naturally infected calves in the netherlands.summary the activity of albendazole against gastrointestinal helminths in naturally infected calves in the netherlands was tested. the calves were in their fist 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 mad ...197922039826
efficacy of avermectin b1a for treatment of experimentally induced nematode infections in cattle.two formulations of avermectin b1a, c-076 and mk-933, were examined for anthelmintic activity in two trials, each using 20 calves with experimentally produced nematode infections. in one trial, c-076 was given orally, and in the other trial, mk-933 was given by injection at dosages of 50, 100, and 200 micrograms/kg of body weight. treated calves were held for 7 to 8 days and then, together with nontreated controls, were euthanatized and were examined for nematodes in their gastrointestinal tract ...19806449894
anthelmintic efficiency of ivermectin against naturally acquired bovine gastrointestinal nematodes.ivermectin, one of the new avermectin group of anthelmintics, was more than 99 per cent effective in removing all stages of ostertagia ostertagi including inhibited larvae, and adult trichostrongylus axei when administered to cattle orally at 100 microgram/kg body-weight or subcutaneously at 100 and 200 microgram/kg body-weight. high efficacy (> 98.6 per cent) was also obtained against adults and inhibited larvae of cooperia oncophora at 100 microgram/kg orally or 200 microgram/kg by subcutaneou ...19806893775
efficacy of ivermectin (22,23-dihydroavermectin b1) against gastrointestinal parasites in ponies.the controlled test method was used to evaluate the antiparasitic efficacy of im inoculated 22,23-dihydroavermectin b1 (ivermectin) against gastrointestinal parasites of horses (ponies). parasite infections were naturally acquired in southern louisiana. dose levels of the drug tested were 0.2 mg/kg, 0.3 mg/kg, and 0.5 mg/kg. ivermectin at all dose levels tested had an efficacy greater than 97% (p less than 0.05) against gasterophilus intestinalis larvae, trichostrongylus axei, oxyuris equi larva ...19806894221
influence of plasma a esterase on anthelmintic action of haloxon in sheep.controlled trials were conducted to evaluate the anthelmintic action of haloxon in 2 phenotypes of lambs, 1 having an a esterase in plasma which rapidly hydrolyzes di-(2-chloroethyl)aryl phosphates and the other without this enzyme. a total of 116 lambs, 57 with and 59 without the plasma a esterase, 6 to 9 months old, harboring naturally acquired nematode infections were used in 3 trials. haloxon was administered orally at 20, 25, and 35 mg/kg of body weight. nematodes against which haloxon was ...19807212415
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