Studies of parasitic helminths of sheep and goats in Ghana.

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    ABSTRACT: West African Dwarf (WAD) goats serve an important role in the rural village economy of West Africa, especially among small-holder livestock owners. They have been shown to be trypanotolerant and to resist infections with Haemonchus contortus more effectively than any other known breed of goat. In this paper we review what is known about the origins of this goat breed, explain its economic importance in rural West Africa and review the current status of our knowledge about its ability to resist parasitic infections. We suggest 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 nematode susceptible, breeds of goats to resist infection, without recourse to anthelmintics. Either conventional breeding allowing introgression of resistance alleles into susceptible breeds, or transgenesis could be exploited for this purpose. Appropriate legal protection of the resistance alleles of WAD goats might provide a much needed source of revenue for the countries in West Africa where the WAD goats exist and where currently living standards among rural populations are among the lowest in the world.
    Parasites & Vectors 01/2011; 4:12. · 3.25 Impact Factor
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    ABSTRACT: A study was conducted to determine the prevalence and types of coccidia species in slaughter goats and sheep in Tanzania. A total of 91% (191210) of goats and 93% (4043) of sheep were infected with coccidia. The mean coccidia oocyst counts were 3200 g −1 faeces (range 100–46000) in goats and 2900 g−1 faeces (range 100–11400) in sheep. Eimeria species found in goats were Eimeria alijevi (63%). Eimeria arloingi (55%), Eimeria caprina (26%), Eimeria ninakohlyakimouae (26%), Eimeria caprovina (16%), Eimeria hirci (5%), Eimeria jolchijeui (5%) and Eimeria christenseni (3%). Eimeria crandallis (96%), Eimeria parva (92%), Eimeria ovinoidalis (29%), Eimeria bakuensis (29%), Eimeria faurei (29%), Eimeria ahsata (21%) and Eimeria granulosa (8%) infected the sheep. This is the first report on coccidia infecting goats in Tanzania. The presence of pathogenic species of Eimeria in goats (Eimeria alijevi, E. arloingi, E. ninakohlyakimovae and E. christenseni) and in sheep (E. ovinoidalis and E. ahsata) suggests that coccidiosis may be contributing to the enteric syndromes affecting small ruminants in the country.
    Small Ruminant Research 06/1996; 21(2):127-131. · 1.10 Impact Factor
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    ABSTRACT: The sheep tapeworm, Moniezia expansa, occurred in 100% of lambs and wethers during the wet warm season (15 Jun–15 Dec) on the U.S. Virgin Island of St. Croix in 1999. In total, 924 mm of precipitation was measured during this period. In the early dry season and mid-dry season, the percentage of lambs and wethers infected was 25 and 44%, respectively. In total, 424 mm of rainfall was measured during this period (16 Dec 1999–15 Jun 2000). During the transition from wet to dry seasons, prevalence was lower in ewes (peaking at 29.6%) than in offspring. In lambs and wethers, prevalence increased to 58% and then declined to 44.4%. Temperature averaged 25°C during the wet season and 29.4°C during the dry season. Eggs per gram of feces (EPG), determined by the modified McMaster method, followed a similar pattern, peaking at 1,698 EPG in the wet season, 2,008 EPG in the early dry season, and 939 EPG in the mid-dry season. Infections were heavier and of greater duration in the wet season. The study started in September 1999 and ended in August 2000.
    Comparative Parasitology 01/2009; · 0.74 Impact Factor