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The effects of breed (Menz and Horro), season (wet and dry), and the breed by season interaction on production and response to naturally acquired gastro-intestinal (GI) nematode parasite infections (predominantly Longistrongylus elongata and Trichostrongylus spp. and a small proportion of Haemonc...


Rege, J.E.O.Tembely, S.Mukasa-Mugerwa, E.Sovani, S.Anindo, D.O.Lahlou-Kassi, A.Nagda, S.M.Baker, R.L.[Effect of breed and season on production and response to infections with gastro-intestinal nematode parasites in sheep in the highlands of Ethiopia]Effect of breed and season on production and response to infections with gastro-intestinal nematode parasites in sheep in the highlands of Ethiopia

Sabi and Dorper ewes were evaluated for resistance to gastro-intestinal nematode parasites (predominantly Haemonchus contortus) at the Matopos Research Station in Zimbabwe. Live weights (LWT), blood packed red cell volume (PCV) and faecal egg counts (FEC) were recorded at mating, 1 month before...


Matika, O.Nyoni, S.Wyk, J.B. vanErasmus, G.J.Baker, R.L.[Resistance of Sabi and Dorper ewes to gastro-intestinal nematode infections in an African semi-arid environment]Resistance of Sabi and Dorper ewes to gastro-intestinal nematode infections in an African semi-arid environment

The epidemiology of nematode infections in Menz sheep was studied in the highlands of Ethiopia at the International Livestock Research Institute (ILRI), Debre Berhan Research Station, using a series of tracer lambs grazing contaminated pasture for either 4, 16, 32 or 48 weeks from July 1992 to Ju...


Tembely, S.Lahlou-Kassi, A.Rege, J.E.O.Sovani, S.Diedhiou, M.L.Baker, R.L.[The epidemiology of nematode infections in sheep in a cool tropical environment]The epidemiology of nematode infections in sheep in a cool tropical environment

Ewe reproduction and productivity were studied in the highlands of Ethiopia in Horro and Menz ewes mated to lamb in both the wet and dry seasons from June 1992 to May 1997. The data included a total of 4890 mating records of which 2516 were Menz ewes and 2374 Horro ewes, with 2360 matings in the ...


Mukasa-Mugerwa, E.Anindo, D.O.Sovani, S.Lahlou-Kassi, A.Tembely, S.Rege, J.E.O.Baker, R.L.[Reproductive performance and productivity of Menz and Horro sheep lambing in the wet and dry seasons in the highlands of Ethiopia]Reproductive performance and productivity of Menz and Horro sheep lambing in the wet and dry seasons in the highlands of Ethiopia

Resistance to naturally acquired gastro-intestinal (GI) nematode parasite infections (predominantly Haemonchus contortus) was studied in 166 Red Maasai; 230 Dorper and 294 crossbred (Red Maasai X Dorper) ewes in the sub-humid coastal region of Kenya. Live weights (LWT), blood packed-cell volume (...


Baker, R.L.Mwamachi, D.M.Audho, James O.Aduda, Eric O.Thorpe, W.R.[Genetic resistance to gastro-intestinal nematode parasites in red Maasai, Dorper and Red Maasai X Dorper ewes in the sub-humid tropics]Genetic resistance to gastro-intestinal nematode parasites in red Maasai, Dorper and Red Maasai X Dorper ewes in the sub-humid tropics

A genome-wide scan for quantitative trait loci (QTL) affecting gastrointestinal nematode resistance in sheep was completed using a double backcross population derived from Red Maasai and Dorper ewes bred to F1 rams. This design provided an opportunity to map potentially unique genetic variation a...


Silva, M.V.B.Sonstegard, T.S.Hanotte, Olivier H.Mugambi, J.M.M.García, J.F.Nagda, S.M.Gibson, John P.Iraqi, F.A.McClintock, A.E.Kemp, Stephen J.Boettcher, P.J.Malek, M.Tassell, C.P. vanBaker, R.L.[Identification of quantitative trait loci affecting resistance to gastrointestinal parasites in a double backcross population of Red Maasai and Dorper sheep]Identification of quantitative trait loci affecting resistance to gastrointestinal parasites in a double backcross population of Red Maasai and Dorper sheep

This study quantifies comprehensively both within and between breed differences in resistance to natural infection with gastrointestinal parasites. This research programme was developed from an earlier study in coastal Kenya involving Dorper and Red Maasai X Dorper sheep. It is now part of an ILC...


Baker, R.L.Reynolds, L.Mwamachi, D.M.Audho, James O.Magadi, M.Miller, J.E.[Genetic resistance to gastrointestinal parasites in Dorper and Red Maasai X Dorper lambs in coastal Kenya]Genetic resistance to gastrointestinal parasites in Dorper and Red Maasai X Dorper lambs in coastal Kenya

Disease resistance/tolerance, productivity and efficiency of Red Massai and Dorper sheep evaluated in experiments at the Kenya coast (humid environment) and the Kenya highlands (Semi-arid environment). There were important breed by location interactions for LWT, mortality rates and reproduction r...


Baker, R.L.Mugambi, J.M.M.Audho, James O.Carles, A.B.Thorpe, W.R.[Comparison of Red Maasai and Dorper sheep for resistance to gastro-intestinal nematode parasites productivity and efficiency in a humid and a semi-arid environment in Kenya]Comparison of Red Maasai and Dorper sheep for resistance to gastro-intestinal nematode parasites productivity and efficiency in a humid and a semi-arid environment in Kenya
Autor: Baker, R.L.

Disease is one of the most important biological constraints to small ruminant production in the many different agroclimatic zones of Africa. Loss of production, high levels of mortality and the cost of drugs are some of the major concerns. Current control strategies include vaccination, medicatio...


Baker, R.L.[Genetics of disease resistance in small ruminants in Africa]Genetics of disease resistance in small ruminants in Africa

The purpose of this chapter is two-fold. First, the information available on breeds of sheep and goats that are resistant or resilient to helminthiasis (mainly the GI nematodes) infections are reviewed. This is important information for inclusion of appropriate breeds in integrated endoparasite c...


Baker, R.L.Gray, G.D.[Appropriate breeds and breeding schemes for sheep and goats in the tropics]Appropriate breeds and breeding schemes for sheep and goats in the tropics

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