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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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References

REFERENCES

Allonby, E. M. & Urquhart, G. M. (1975) The epidemiology and pathogenic significance of haemonchosis is a merino flock in East Africa. Veterinary Parasitology, 1, 129–143.CrossRefGoogle Scholar
Armour, J. (1980) The epidemiology of helminth diseases in farm animals. Veterinary Parasitology, 6, 7–46.CrossRefGoogle Scholar
Armour, J. & Hart, J. A. (1962) Investigation of haemonchosis in Nigerian Zebu cattle. Journal of Parasitology, 48, 496.Google Scholar
Asanji, M. F. & Williams, M. O. (1987) Seasonal fluctuations in gastrointestinal helminth parasites of sheep and goats in Sierra Leone. Bulletin of Animal Health and Production in Africa, 35, 191–199.Google Scholar
Assoku, R. K. G. (1981) Studies of parasitic helminths of sheep and goats in Ghana. Bulletin of Animal Health and Production in Africa, 29, 1–10.Google ScholarPubMed
Bailey, N. T. (1981) Statistical methods in Biology 2nd Ed. Hodder and Stoughton, London, Sydney. Auckland and Toronto.Google Scholar
Blitz, M. N. & Gibbs, H. C. (1971) An observation on the maturation of arrested Haemonchus contortus larvae in sheep. Canadian Journal of Comparative Medicine, 35, 178–180.Google ScholarPubMed
Blitz, M. N. & Gibbs, H. C. (1972a) Studies on the arrested development of Haemonchus contortus in sheep. 1. The induction of arrested development. International Journal for Parasitology, 2, 5–12.CrossRefGoogle ScholarPubMed
Blitz, M. N. & Gibbs, H. C. (1972b) Studies on arrested development of Haemonchus contortus in sheep. II. Termination of arrested development and the spring rise phenomenon. International Journal for Parasitology, 2, 13–22.CrossRefGoogle ScholarPubMed
Browne, G. J. (1949) Dentition as indicative of the age of animals of the farm. John Hurray, London pp. 62.Google Scholar
Brunsdon, R. V. (1964) The seasonal variations in the nematode egg counts of sheep: a comparison of the spring rise phenomenon in breeding and unmated ewes. New Zealand Veterinary Journal, 12, 75–80.CrossRefGoogle ScholarPubMed
Clarke, J. J. (1966) Sierra Leone in Maps. University of London Press. 118.Google Scholar
Drobney, R. D., Train, C. T. & Fredrickson, L. H. (1983) Dynamics of the platyhelminth fauna of wood ducks in relation to food habits and reproductive state. The Journal of Parasitology, 69, 375–380.CrossRefGoogle ScholarPubMed
F.A.O., Rome Reports (1965) Agricultural Development in Nigeria 1964–1980. P.B. 503.Google Scholar
Geldorp, P. J. A. & Van Veen, Schillhorn (1976) Periparturient rise in faecal egg counts of Udah sheep in the Zaria area of Nigeria. Veterinary Parasitology, 1, 265–269.CrossRefGoogle Scholar
Gibbs, H. C. (1982) Mechanisms of survival of nematode parasites with emphasis on hypobiosis. Veterinary Parasitology, 11, 25–48.CrossRefGoogle ScholarPubMed
Gregory, S. (1965) Rainfall of Sierra Leone. Arcon Press, Liverpool, pp. 57.Google Scholar
Hart, J. A. (1964) Observations on the dry season strongyle infection of Zebu cattle in Northern Nigeria. British Veterinary Journal, 120, 87–95.CrossRefGoogle Scholar
Kelly, J. D. (1973) Immunity and epidemiology of helminthiasis in grazing animals. New Zealand Veterinary Journal, 21, 183–194.CrossRefGoogle ScholarPubMed
Knight, R. A. (1983) Age resistance of sheep to Fasciola hepatica. Proceedings of the Helminthological Society of Washington, 50, 108–111.Google Scholar
Kuil, H. (1969) Livestock development and parasites. Proceedings of the Conference on Livestock Development in the dry and intermediate savanna zones, Zaria.Google Scholar
Kuil, H. (1970) “Gastrointestinal nematodes in Zaria area of Northern Nigeria”. Report on an investigation subsidised by the Netherlands Foundation for the Advancement of Tropical Research, 1968–1970, Zaria, Nigeria, pp. 1–38.Google Scholar
Larry, C., Stewart, G. L., Kramar, G. W. & Stanfield, J. A. (1981) The effect of host sex on enteric response to infection with Trichinella spiralis. Journal of Parasitology, 67, 917–922.Google Scholar
Lee, R. P., Armour, J. & Ross, J. G. (1960) The seasonal variations in strongyle infestations in Nigeria zebu cattle. British Veterinary Journal, 116, 1–13.CrossRefGoogle Scholar
Mankau, J. A. & Hamilton, R. (1972) The effect of sex and sex hormones on the infection of rats by Trichinella spiralis. Canadian Journal of Zoology, 50, 597–602.CrossRefGoogle ScholarPubMed
Margolis, L., Holmes, J. C., Esch, G. W., Kuris, A. M. & Schad, G. A. (1982) The use of ecological terms in parasitology (Report of an ad hoc committee of American Society of Parasitologists). The Journal of Parasitology, 68, 131–133.CrossRefGoogle Scholar
Mettam, R. M. W. (1965) Annual report of the Veterinary Department. Government Printer Kaduna, Nigeria.Google Scholar
Ogunsusi, R. A. A. (1979) Termination of arrested development of the trichostrongyles of sheep in Northern Nigeria. Research in Veterinary Science, 26, 189–192.CrossRefGoogle ScholarPubMed
Okon, E. D. & Enyenihi, U. K. (1977) Development and survival of Haemonchus contortus larvae on pasture in Ibadan. Tropical Animal Health and Production. 9, 7–10.CrossRefGoogle ScholarPubMed
Reddington, J. J., Stewart, G. L., Kramar, G. W. & Kramar, M. A. (1981) The effect of host sex and hormones on Trichinella spiralis in the mouse. Journal of Parasitology, 67, 545–548.CrossRefGoogle ScholarPubMed
Roberts, J. L. & Swan, R. A. (1981) Quantitative studies of ovine haemonchosis. I. Relationship between faecal egg counts and total worm counts. Veterinary Parasitology, 8, 165–171.CrossRefGoogle Scholar
Schad, G. A. (1977) The role of arrested development in the regulation of nematode populations. In: Regulation of Parasite Populations. Academic Press, New York, San Francisco, London pp. 111–167.Google Scholar
Schillhorn Van Veen, T. J. (1981) Prevention of acute haemonchosis in lambs in the rainy season in Northern Nigeria. Bulletin of Animal Health and Production in Africa, 29, 279–283.Google ScholarPubMed
Schillhorn Van Veen, T. W. & Ogunsusi, R. A. A. (1978) Periparturient and seasonal rise in the trichostrongylid egg out-put of infected ewes during the dry season in Northern Nigeria. Veterinary Parasitology, 4, 377–383.CrossRefGoogle Scholar
Thomas, R. J. (1982) The ecological bases of parasite control: Nematodes. Veterinary Parasitology, 11, 9–24.CrossRefGoogle Scholar
Urquhart, G. M., Jarrett, W. F. H., Jennings, F. W., Mcintyre, W. I. M., Mulligan, W. & Sharp, N. C. C. (1966a) Immunity to Haemonchus contortus infection. Failure of X-irradiated larvae to immunise young lambs. American Journal of Veterinary Research, 27, 1641–1643.Google ScholarPubMed
Urquhart, G. M., Jarrett, W. F. H., Jennings, F. W., Mcintyre, W. I. M. & Mulligan, W. (1966b) Immunity to Haemonchus contortus infection. Relationship between age and successful vaccination with irradiated larvae. American Journal of Veterinary Research, 27, 1645–1648.Google ScholarPubMed