Inhibited development of<i>Ostertagia</i>spp. and<i>Cooperia</i>spp. in naturally acquired infections in calves

Rv, Brunsdon

doi:10.1080/00480169.1972.34047

Cited by 40 publications

(13 citation statements)

References 13 publications

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“…At Wallaceville, spring-born calves grazed continuously with the tracer calves and were also slaughtered at intervals (7). When yearlings, their corresponding September inhibition level was 60% and, because of 30 NEW ZEALAND VETERINARY JOURNAL VOL.…”

Section: Epidemiology and Incidence Related To Locality And Climatementioning

confidence: 99%

Ostertagiasis survey: summary and discussion

Chalmers

1980

New Zealand Veterinary Journal

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Opinions offered by 127 veterinary practitioners indicated that cattle ostertagiasis occurred throughout New Zealand; it was seen in all age-groups regularly in some regions; poorly fed animals were more susceptible to outbreaks accompanied by a gradual decline in health; both poor and well-fed cattle were subject to sudden outbreaks which were almost entirely associated with nutritional changes. Most cases were diagnosed by clinical signs. The prescription of multiple anthelmintic doses was the most common treatment.According to research data, winter and summer conditions reduced O. ostertagi numbers on pasture. Survival depended on a gradual accumulation of inhibited larvae before winter and a reduction after summer. Although clinical type II cases usually occurred in the winter and spring, it was theorised that subclinical production losses were more likely to occur in the autumn.Management was solely responsible for the level of pasture contamination and animal health. Similar O. ()stertagi burdens were recorded in heavy and light cattle, although the latter were more likely to succumb to disease. Changes in worm populations were demonstrated on a farm during a 3-year period. Changes in diagnostic and treatment procedures using plasmapepsinogen estimations and longeracting anthelmintics were discussed.

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Section: Epidemiology and Incidence Related To Locality And Climatementioning

confidence: 99%

Ostertagiasis survey: summary and discussion

Chalmers

1980

New Zealand Veterinary Journal

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“…In contrast to the Lelystad strain, this strain showed inhibition of development as a result of environmental stimuli though the levels of inhibition were lower than in Glasgow and Weybridge field strains. An O. ostertagi strain which behaved similarly to the Lelystad strain was described in New Zealand (Brunsdon, 1972).…”

Section: Discussionmentioning

confidence: 99%

Strains of cattle parasites in the netherlands with different propensities for inhibited development

Borgsteede¹,

Eysker

1987

Veterinary Parasitology

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“…Post-mortem processing and worm-counting procedures At the end of the experiments, sheep were humanely slaughtered and the abomasums were removed and processed using the method described by Brunsdon (1972). In brief, the contents of the abomasum were thoroughly washed out and the respective washings were made up to 8 l. Next, 800 ml of this material was passed through 45-lm mesh sieve and the retained parasites were preserved in 10% formalin solution.…”

Section: Methodsmentioning

confidence: 99%

Immunisation of lambs with drug-abbreviated Haemonchus contortus infections: protection against homologous and heterologous challenge

et al. 2000

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Haemonchus contortus is known as a prolific parasite, producing high numbers of eggs. It could therefore be used as a cheap source of larvae for immunisation of lambs. The value of immunisation would be improved if the immunity produced gave protection against not only homologous but also heterologous infections. Because antibody cross-reactivity between Haemonchus and Ostertagia has been well established, we wanted to know whether drug-abbreviated infections of H. contortus would stimulate production of antibodies that would cross-react with Trichostrongylus colubriformis. The results obtained from these trials indicated that H. contortus drug-abbreviated infections produced significant immunity against not only Haemonchus but also O. circumcincta. Immunisation increased the level of immunoglobulin E (IgE) and IgE-specific antibodies against T. colubriformis, but the differences between experimental and control animals were not statistically significant. Significantly higher levels of IgG-specific antibodies against T. colubriformis were observed.

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Inhibited development ofOstertagiaspp. andCooperiaspp. in naturally acquired infections in calves

Cited by 40 publications

References 13 publications

Ostertagiasis survey: summary and discussion

Ostertagiasis survey: summary and discussion

Strains of cattle parasites in the netherlands with different propensities for inhibited development

Immunisation of lambs with drug-abbreviated Haemonchus contortus infections: protection against homologous and heterologous challenge

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