Journal ArticleDOI
Development and survival of free-living stages of gastrointestinal nematodes of sheep and goats on pasture in the Nigerian derived savanna.
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The results indicate that it is unlikely that gastrointestinal nematodes of sheep and goats can develop or survive on open pasture during the dry season in the Nigerian derived savanna zone.Abstract:
Four grass plots were sequentially contaminated with goat faeces containing known numbers of unembryonated eggs of predominantly Haemonchus contortus and Trichostrongylus spp. between October 1982 and April 1983. Four other plots were similarly contaminated with sheep faeces between February and May 1987. An additional plot was repeatedly contaminated with sheep faeces from February to April 1987. Populations of free-living stages in faeces and of infective larvae (L3) in the herbage were subsequently monitored until the end of April and June of 1983 and 1987 respectively. During February and May 1987 two control cultures of sheep faeces were incubated in the laboratory at 25°C–30°C and at a constant temperature of 50°C and the free-living development was also monitored. L3 developed very readily in the faeces cultured at 25°C–30°C and in those spread on a grass plot in October, at the end of the wet season, but developed less on the plot contaminated in May at the start of the wet season. Worm eggs in faeces deposited on plots during the hot dry season (December to April) or incubated at 50°C died and disintegrated after 24–48 h exposure to the high environmental temperatures. The results indicate that it is unlikely that gastrointestinal nematodes of sheep and goats can develop or survive on open pasture during the dry season in the Nigerian derived savanna zone.read more
Citations
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Journal ArticleDOI
Ecology of the free-living stages of major trichostrongylid parasites of sheep.
TL;DR: A logical framework is proposed for future ecological investigations to overcome some of the problems of the existing body of knowledge, facilitate the development of a more integrated dataset on the subject and improve prediction of free-living development.
Journal ArticleDOI
The epidemiology of helminthosis in small ruminants under the traditional husbandry system in eastern Nigeria
TL;DR: The overall trend in helminthosis in these animals was that of an escalating worm burden during the period of confinement and a low worm burden when animals were allowed free range and these periods corresponding to the cropping and harvest seasons respectively.
Journal ArticleDOI
Seasonal and demographic factors influencing gastrointestinal parasitism in ungulates of Etosha National Park.
TL;DR: Results provide evidence that acquired immunity is less protective against strongyle nematodes than Eimeria spp.
Journal ArticleDOI
The unique resistance and resilience of the Nigerian West African Dwarf goat to gastrointestinal nematode infections
S.N. Chiejina,Jerzy M. Behnke +1 more
TL;DR: It is suggested that its unique capacity to show both trypanotolerance and resistance to gastrointestinal (GI) nematode infections is immunologically based and genetically endowed, and that knowledge of the underlying genes could be exploited to improve the capacity of more productive wool and milk producing, but GI nematodes susceptible, breeds of goats to resist infection, without recourse to anthelmintics.
Journal ArticleDOI
Ecological, morphological and genetic characterization of sympatric Haemonchus spp. parasites of domestic ruminants in Mauritania.
TL;DR: The ecological, morphological and genetical studies showed that, although the 3 species were valid, H. longistipes behave differently during the pre-rainy season as no increase of prolificacy could be demonstrated as observed in the other species.
References
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Journal ArticleDOI
Manual of veterinary parasitological laboratory techniques: Ministry of Agriculture, Fisheries and Food, Agricultural Development and Advisory Service, Technical Bulletin No. 18, 2nd edition, 1977, iii + 129 pp., 16 figs., XI plates, 9 tables, Price £3.50
Journal ArticleDOI
Studies on parasitic worms of sheep in Scotland. I. Embryonic and larval development of Haemonchus contortus at constant conditions.
Silverman Ph,Campbell Ja +1 more
TL;DR: Observations showed that eggs in the same culture may behave in several ways: eggs may develop at different rates; eggs may exhibit intermittent stages of active and inhibited development; and eggs may fail to develop and die at any stage from unknown causes.
Journal ArticleDOI
Inhibited development of trichostrongylids of sheep in northern Nigeria.
R.A. Ogunsusi,M. Eysker +1 more
TL;DR: Worm counts from Yankassa ewes, lambs and tracer lambs grazing unimproved pasture at Zaria were obtained each month during the rainy season of 1976 and most of the abundant late L4 contained rodlike crystals.
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Manual of veterinary parasitological laboratory techniques: Ministry of Agriculture, Fisheries and Food, Agricultural Development and Advisory Service, Technical Bulletin No. 18, 2nd edition, 1977, iii + 129 pp., 16 figs., XI plates, 9 tables, Price £3.50
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Inhibited development of trichostrongylids of sheep in northern Nigeria.
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