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Resistance to nematode parasites can be improved by selection, but efforts to include appropriate traits in commercial livestock breeding programs are only a recent development. Procedures for including resistance in breeding programs are similar to those involving other traits. The steps are des...


Woolaston, R.R.Baker, R.L.[Prospects of breeding small ruminants for resistance to internal parasites]Prospects of breeding small ruminants for resistance to internal parasites

The paper reviews the evidence of genetic resistance to endoparasites both within and between breeds of sheep and goats and assesses the possibilities of breeding for increased resistance. In light of this evidence, ILCA has developed a Pan-African research programme to investigate and characteri...


Baker, R.L.Lahlou-Kassi, A.Rege, J.E.O.Reynolds, L.Tekelye BekeleMukasa-Mugerwa, E.Rey, B.[A review of genetic resistance to endoparasites in small ruminants and an outline of ILCA's research programme in this area]A review of genetic resistance to endoparasites in small ruminants and an outline of ILCA's research programme in this area

Six first cross (F1) Red Maasai X Dorper rams were mated to both Red Maasai (R) and Dorper (D) ewes to produce 1342 double backcross progeny (672 3/4 D/1/4 R and 670 3/4 R/1/4 D lambs born alive). These six double backcross resource families are being used to identify quantitative trait loci con...


Mugambi, J.M.M.Audho, James O.Baker, R.L.[Evaluation of the phenotypic performance of a Red Maasai and Dorper double backcross resource population: Natural pasture challenge with gastro-intestinal nematode parasites]Evaluation of the phenotypic performance of a Red Maasai and Dorper double backcross resource population: Natural pasture challenge with gastro-intestinal nematode parasites

The effects of breed and dietary protein supplementation on the development of resistance and resilience to gastrointestinal nematode parasites (endoparasites) were examined in artificially infected Horro and Menz lambs from 4 to 12 months of age. The factorial design involved two breeds, two inf...


Haile, AynalemTembely, S.Anindo, D.O.Mukasa-Mugerwa, E.Rege, J.E.O.Yami, A.Baker, R.L.[Effects of breed and dietary protein supplementation on the responses to gastro intestinal nematode infections in Ethiopian sheep]Effects of breed and dietary protein supplementation on the responses to gastro intestinal nematode infections in Ethiopian sheep

Six F1 Dorper (D) x Red Maasai (R) rams were mated to both D and R ewes to produce backcross lambs. These six double backcross resource families are being analysed to identify quantitative trait loci that may be controlling resistance to gastro-intestinal (GI) nematode parasites, mainly Haemonchu...


Mugambi, J.M.M.Audho, James O.Njomo, S.Baker, R.L.[Evaluation of the phenotypic performance of a Red Maasai and Dorper double backcross resource population: Indoor trickle challenge with Haemonchus contortus]Evaluation of the phenotypic performance of a Red Maasai and Dorper double backcross resource population: Indoor trickle challenge with Haemonchus contortus

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 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

Studies the within-and between-breed differences in resistance to natural infection with gastro-intestinal parasites and identifies genetic markers to aid in the selection of animals. Data analysed include PCV (Packed Cell Volume), live weight from birth to 360 days and faecal egg counts.


Reynolds, L.Baker, R.L.Sherington, J.Njubi, D.[Resistance to gastro-intestinal parasites in Dorper and Red Maasai-Dorper crossbred sheep]Resistance to gastro-intestinal parasites in Dorper and Red Maasai-Dorper crossbred sheep

This Report compares the efficacies of three anthelmintics, each belonging to one of the broad spectrum groups. It also identifies the genera of resistant worms through larval culture. The study was conducted on a commercial farm where anthelmintics had been used intensively. The results show cle...


Mwamachi, D.M.Audho, James O.Magadi, M.Reynolds, L.Baker, R.L.[Evidence for multiple anthelmintic resistance of gastrointestinal nematodes in sheep in coastal Kenya]Evidence for multiple anthelmintic resistance of gastrointestinal nematodes in sheep in coastal Kenya

The economic and biological efficiency of cotton seed cake (CSC) and molasses urea block (MUB) supplementation to control gastrointestinal nematode parasites was examined in artificially infected Horro and Menz lambs from 3 to 12 months of age. The factorial O.xperimental design involved 2 breeds...


Haile, AynalemBaker, R.L.Rege, J.E.O.[Economics of gastrointestinal nematode parasite control: The case of protein supplementation]Economics of gastrointestinal nematode parasite control: The case of protein supplementation

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