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Haemonchosis in sheep and goats in Sierra Leone

Published online by Cambridge University Press:  05 June 2009

M. F. Asanji
M. F. Asanji
Affiliation:
Department of Biological Sciences, Ecole Normale Supérieure, Bambili, Mezam Division, North West Province, Republic of Cameroon
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Abstract

The incidence of haemonchosis in sheep and goats in Sierra Leone showed a seasonal variation with a high peak in the dry season (October to January) and a low one from March to May. Mean relative densities were significantly higher in young hosts and showed two peaks, a high one from August to December and a low one from April to June while the mean relative densities of old hosts were low and exhibited an irregular seasonal pattern with no defined peaks. The peak seasons in young hosts coincided approximately with the dry and rainy seasons. Male hosts showed an overall higher but not a significant mean relative density than females but for most of the months mean relative densities of infection of female hosts were not significantly higher than those of males. The roles of climatic conditions and arrested development (hypobiosis) and self-cure and host age immunity on Haemonchus contortus worm burdens are discussed.

Keywords

Haemonchus contortussheepgoatSierra Leoneseasonal variation
Type
Research Papers
Information
Journal of Helminthology , Volume 62 , Issue 3 , September 1988 , pp. 243 - 249
Copyright
Copyright © Cambridge University Press 1988

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