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The effect of season of shearing on the periparturient rise in nematode egg output in ewes

Published online by Cambridge University Press:  23 November 2017

B. Good
Affiliation:
Teagasc, Galway, Ireland
T.W.J. Keady
Affiliation:
Teagasc, Galway, Ireland
J.P. Hanrahan
Affiliation:
Teagasc, Galway, Ireland
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Extract

Previous studies (Keady et al., 2007; Keady & Hanrahan, 2007) at Athenry have shown that shearing ewes at housing increases subsequent lamb birth and weaning weights. Keady et al., (2007) reported that shearing at housing increased gestation length whilst Keady and Hanrahan (2007) reported that shearing increased food intake, both indicative of reduced heat stress. The temporary loss of acquired immunity to gastrointestinal nematodes that is associated with an increased faecal egg output in late pregnancy and early lactation, is a well established phenomenon and is important in the epidemiology of nematode parasites of sheep. Given the association between nutrition (Donaldson et al., 1997; 1998; Coop and Kyriazakis, 1999; Houdijk et al., 2000) and the periparturient rise in nematode eggs (PPR) in ewes, the increased food intake evoked by shearing at housing, may have an impact on the PPR. The aim of this study was to evaluate the effect of season of shearing on the periparturient rise in nematode egg output in ewes.

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Copyright © The British Society of Animal Science 2008

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References

Coop, R. L. and Kyriazakis, I. 1999. Nutrition - parasite interaction. Veterinary Parasitology 84: 187–204.CrossRefGoogle ScholarPubMed
Donaldson, J., Houtert, Van, and Sykes, A.R. 1997. The effect of protein supply on the periparturient parasite status of the mature ewe. Proceedings of the New Zealand of Animal Production 57: 186–189.Google Scholar
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Houdijk, J.G.M., Kyriazakis, I., Jackson, F., Huntley, J.F., Coop, R.L. 2000. Can an increased intake of metabolizable protein affect the periparturient relaxation in immunity against Teladorsagia circumcincta in sheep. Veterinary Parasitology, 91: 43–62.CrossRefGoogle Scholar
Keady, T.W.J. and Hanrahan, J.P. 2007 Effects of shearing at housing, extended grazing herbage allowance and grass silage feed value on ewe and subsequent lamb performance Animal (in press).Google Scholar
Keady, T.W.J., Hanrahan, J.P. and Flanagan S. 2007. Effect of extended grazing during mid, late or throughout pregnancy and winter shearing indoors on ewe performance and subsequent lamb growth rate. Irish Journal of Agriculture Research (in press).Google Scholar

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