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Inhibited development of Ostertagia ostertagi in relation to production systems for cattle

Published online by Cambridge University Press:  06 April 2009

M. G. Smeal  and
A. D. Donald
M. G. Smeal
Affiliation:
New South Wales Department of Agriculture, Veterinary Research Station, Glenfield, New South Wales 2167, Australia
A. D. Donald
Affiliation:
C.S.I.R.O. Division of Animal Health, McMaster Laboratory, Glebe, New South Wales 2037, Australia
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Summary

On a coastal farm in New South Wales where beef and dairy cattle production was carried on side-by-side, separate pasture plots were contaminated with eggs of Ostertagia ostertagi by calves from each production system in autumn, winter or spring. Successive groups of parasite-free tracer calves grazed on the plots for 14 days at 4-week intervals and were then killed for worm counts 14 days after removal from pasture. On all plots, the proportion of inhibited early 4th-stage larvae in tracer calves reached a maximum in spring, and was consistently and very significantly higher in calves which grazed plots contaminated with O. ostertagi of beef cattle origin. Factors which may be responsible for this difference between beef and dairy cattle populations of O. ostertagi are discussed.

Type
Research Article
Information
Parasitology , Volume 85 , Issue 1 , August 1982 , pp. 21 - 25
Copyright
Copyright © Cambridge University Press 1982

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References

Smeal, M. G. & Donald, A. D. (1981). Effects on inhibition of development of the transfer of Ostertagia ostertagi between geographical regions of Australia. Parasitology 82, 389–99.CrossRefGoogle ScholarPubMed
Smeal, M. G., Fraser, G. C. & Robinson, G. C. (1980). Seasonal changes in the structure of nematode populations of cattle in New South Wales in relation to inhibited larval development. Australian Veterinary Journal 56, 80–6.CrossRefGoogle ScholarPubMed
Smeal, M. G., Robinson, G. G. & Fraser, G. C. (1980). Seasonal availability of nematode larvae on pastures grazed by cattle in New South Wales. Australian Veterinary Journal 56, 74–9.CrossRefGoogle ScholarPubMed