| 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 |
| [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 |
| [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 ... | 1978 | 754678 |
| 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 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 |
| [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 |
| efficacy of febantel paste against naturally acquired gastrointestinal nematodes of cattle. | twenty calves with naturally acquired gastrointestinal nematode infections were assigned to 10 replicates of 2 calves each and were treated with febantel paste (5 mg/kg of body weight, po) or an equivalent volume of paste vehicle (control calves). adverse reactions were not observed after febantel treatment. at necropsy, gastrointestinal nematode counts in febantel-treated calves, compared with control calves, were reduced by over 99% for all major species except trichuris discolor, counts of wh ... | 1988 | 3192439 |
| parasites of moose (alces alces) from an agricultural area of eastern ontario. | viscera of 16 moose and hide samples of 24 moose (alces alces) shot in eastern ontario in 1985 were examined for parasites. two species of trematodes, one species of cestode, five species of nematodes and one species of tick were recovered. one nematode species, trichuris discolor, is reported for the first time from moose. our results suggest that the parasite fauna of the moose may have been influenced by the absence or scarcity of other species of wild cervids or carnivores and by the presenc ... | 1988 | 3373648 |
| whipworm (trichuris discolor) infection in dairy replacement heifers. | trichuriasis caused by trichuris discolor was diagnosed in a 19-month-old holstein heifer examined because of emaciation, diarrhea, recumbency, and oral ulceration. the heifer's problem was representative of a herd problem involving pastured replacement heifers. euthanasia was elected due to the heifer's moribund state and poor prognosis. gross necropsy revealed subcutaneous edema and diffuse edema of the colon, with hundreds of adult trichuris discolor in the cecum and colon. histologic examina ... | 1986 | 3710897 |
| 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 |
| [infection of calves by trichuris discolor]. | | 1973 | 4756811 |
| fatal trichuris discolor infection in a holstein-freisian heifer. report of a case. | | 1972 | 5061944 |
| a clinical outbreak of trichuris discolor infection in stabled calves. | | 1970 | 5464372 |
| redescriptions of trichuris discolor (von linstow, 1906) and t. skrjabini (baskakov, 1924) from domestic ruminants in the united states and comparisons with t. ovis (abildgaard, 1795). | | 1971 | 5553447 |
| partial characterization of larval antigens of strongyloides papillosus by western blot analysis. | western blotting was used to analyse the antigens in extracts of adult and infective larvae (sil) of strongyloides papillosus with serum of infected rabbits. several proteins in both the extracts reacted with immunoglobulin g in the serum. a protein of about 16 kda in the extract of sil showed an especially strong reaction. no cross-reaction was observed among proteins in the extracts of adult worms of such cattle helminths as fasciola gigantica, homalogaster paloniae, trichuris discolor and set ... | 1994 | 7812315 |
| efficacy of injectable abamectin against gastrointestinal tract nematodes and lungworms of cattle. | efficacy of abamectin against gastrointestinal tract nematodes and lungworms of cattle was determined in 4 experiments. the first 2 experiments were controlled trials in which efficacy was determined at necropsy in calves with either experimentally induced (n = 14) or naturally acquired (n = 16) infections. half the calves in each experiment were treated with abamectin (200 micrograms/kg of body weight, sc), and half were left untreated as controls. efficacy was > 99% against adult stages of dic ... | 1994 | 8192257 |
| efficacy of doramectin against field nematode infections of cattle in latin america. | two studies were conducted, one in argentina and one in brazil, to evaluate the therapeutic efficacy of doramectin administered subcutaneously at a dose rate of 200 micrograms kg-1 (1 ml per 50 kg) to cattle harboring mixed field infections of gastrointestinal nematodes. in each trial, 20 heifers were randomly allocated to a control or treated group of ten animals each, on the basis of fecal egg counts. animals in the treated and control groups received an injection of doramectin or saline in th ... | 1993 | 8236736 |
| efficacy of abamectin against nematodes in cattle. | eight controlled trials were conducted, using 96 cattle of european breeds, to evaluate the efficacy of abamectin against natural and artificially acquired infections of adult and fourth-stage larvae of all the economically important gastrointestinal nematodes and lungworms in germany and the united kingdom. half the animals were treated on one occasion with abamectin at a dose of 200 micrograms/kg bodyweight given subcutaneously while the other half remained untreated. worms were counted 14 or ... | 1993 | 8442334 |
| seasonal infection pattern of gastrointestinal nematodes of beef cattle in minas gerais state--brazil. | tracer calves were used to assess the seasonality of infections of gastrointestinal parasites in beef cattle extensively raised at a farm in the state of minas gerais, brazil. tracer calves acquired infections during all months of the year, however, highest worm burdens were observed in the rainy season. the following nematode species were recovered from tracer calves: cooperia punctata, c. spatulata, c. pectinata, haemonchus similis, h. placei, oesophagostomum radiatum, trichostrongylus colubri ... | 1998 | 9561708 |
| dose confirmation studies of moxidectin 1% non-aqueous injectable and moxidectin 0.5% pour-on formulations against experimentally induced infections of larval and adult stage oesophagostomum radiatum and trichuris discolor in cattle. | separate controlled trials were conducted to evaluate the efficacy of two formulations of moxidectin (1% non-aqueous injectable solution and 0.5% pour-on (cydectin) against larval or adult stages of oesophagostomum radiatum and trichuris discolor infecting cattle. fifty-three strongylate-free dairy breed steer calves were obtained from commercial sources. after a brief acclimation period, calves were randomly divided into two pools to evaluate the efficacy of the moxidectin formulations against ... | 2002 | 12191901 |
| anthelmintic efficacy of oral trichlorfon solution against ivermectin resistant nematode strains in cattle. | infected calves from two different rural estates in brazil were studied to assess the anthelmintic efficacy of oral trichlorfon against naturally occurring ivermectin resistant parasitic nematode strains. in experiment i, infected animals were from a region where ivermectin resistant populations of haemoncus placei, cooperia punctata, cooperia spatulata and trichuris discolor have recently been identified. six calves with natural gastrointestinal nematode infections were treated with 48.5mg/kg a ... | 2009 | 19709817 |
| 16S partial gene mitochondrial DNA and internal transcribed spacers ribosomal DNA as differential markers of Trichuris discolor populations. | Comparative morphological, biometrical and molecular studies of Trichuris discolor isolated from Bos taurus from Spain and Iran was carried out. Furthermore, Trichuris ovis isolated from B. taurus and Capra hircus from Spain has been, molecularly, analyzed. Morphological studies revealed clear differences between T. ovis and T. discolor isolated from B. taurus but differences were not observed between populations of T. discolor isolated from different geographical regions. Nevertheless, the mole ... | 2011 | 22136768 |
| nematode burdens of pastured cattle treated once at turnout with eprinomectin extended-release injection. | the efficacy of eprinomectin in an extended-release injection (eri) formulation was evaluated against infections with third-stage larvae or eggs of gastrointestinal and pulmonary nematodes in cattle under 120-day natural challenge conditions in a series of five studies conducted in the usa (three studies) and in europe (two studies). for each study, 30 nematode-free (four studies) or 30 cattle harboring naturally acquired nematode infections (one study) were included. the cattle were of various ... | 2012 | 23273928 |
| the efficacy of eprinomectin extended-release injection against naturally acquired nematode parasites of cattle, with special regard to inhibited fourth-stage ostertagia larvae. | the efficacy of eprinomectin in an extended-release injection (eri) formulation in the treatment of cattle harboring naturally acquired nematode populations (including inhibited nematodes) was evaluated. five studies were conducted under a similar protocol in the usa, the uk, and in germany. all study animals were infected by grazing naturally contaminated pastures. the adequacy of pasture infectivity was confirmed by examining tracer calves prior to allocation and treatment of the study animals ... | 2012 | 23273781 |
| activity of ivermectin long-acting injectable (ivomec(®) gold) in first-season grazing cattle exposed to natural challenge conditions in germany. | the persistent activity of ivermectin long-acting injection (ivm lai; ivomec® gold, merial; 3.15% ivermectin w/v) against nematode infections of cattle was evaluated under natural challenge conditions. seventy nematode-free brown swiss calves were blocked by pre-treatment bodyweight and allocated randomly to seven groups of 10 animals each: saline (control) at 1 ml/50 kg bodyweight once on day 0 or ivm lai at 1 ml/50 kg bodyweight (630 mcg ivm/kg) on either days 0, 7, 14, 21, 28, or 35. after ho ... | 2015 | 25280515 |
| the first determination of trichuris sp. from roe deer by amplification and sequenation of the its1-5.8s-its2 segment of ribosomal dna. | trichuris nematodes were isolated from roe deer (capreolus capreolus). at first, nematodes were determined using morphological and biometrical methods. subsequently genomic dna was isolated and the its1-5.8s-its2 segment from ribosomal dna (rna) was amplified and sequenced using pcr techniques. with u sing morphological and biometrical methods, female nematodes were identified as trichuris globulosa, and the only male was identified as trichuris ovis. the females were classified into four morpho ... | 2013 | 23242267 |
| characterization of the complete mitochondrial genomes of two whipworms trichuris ovis and trichuris discolor (nematoda: trichuridae). | for many years, whipworms (trichuris spp.) have been described with a relatively narrow range of both morphological and biometrical features. moreover, there has been insufficient discrimination between congeners (or closely related species). in the present study, we determined the complete mitochondrial (mt) genomes of two whipworms trichuris ovis and trichuris discolor, compared them and then tested the hypothesis that t. ovis and t. discolor are distinct species by phylogenetic analyses using ... | 2012 | 22926017 |
| reliable molecular differentiation of trichuris ovis and trichuris discolor from sheep (ovis orientalis aries) and roe deer (capreolus capreolus) and morphological characterisation of their females: morphology does not work sufficiently. | the main aim of the study was to evaluate associations between morphological variability of trichuris females from sheep and roe deer and their rdna polymorphism in whipworm populations from the czech republic. the results introduced the use of new molecular markers based on the internal transcribed spacer (its)1-5.8s rna-its2 region polymorphisms, as useful tools for the unambiguous differentiation of congeners trichuris ovis and trichuris discolor. these markers revealed both parasites in roe ... | 2017 | 28624874 |