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The survival rates of Dorper, Red Maasai and crossbred lambs born over a period of 6 years at Diani Estate, Coast Province, Kenya were compared using the Cox mixed proportional hazards model with a random (frailty) term for sire. Of the 1785 lambs born, proportionately 0.44 died before they were ...


Nguti, R.Janssen, P.Rowlands, G.J.Audho, James O.Baker, R.L.[Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics]Survival of Red Maasai, Dorper and crossbred lambs in the sub-humid tropics

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

A study was conducted to estimate heritabilities of, and genetic correlations among, body weight (WT) and testicular measurements - scrotal circumference (SC), testicular diameter (TD), testicular length (TL) and epididymal diameter (ED - in ram lambs between 6, 9 and 12 months old, and relations...


Toe, F.Rege, J.E.O.Mukasa-Mugerwa, E.Tembely, S.Anindo, D.O.Baker, R.L.Lahlou-Kassi, A.[Reproductive characteristics of Ethiopian highland sheeI. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs]Reproductive characteristics of Ethiopian highland sheeI. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs

A study was conducted to investigate the effect of season on, and to estimate heritabilities of, and genetic correlations among, semen and spermatozoa characteristics and the relationship of these characteristics with measures of testicular or scrotal size in 6-, 9- and 12-month old ram lambs of ...


Rege, J.E.O.Toe, F.Mukasa-Mugerwa, E.Tembely, S.Anindo, D.O.Baker, R.L.Lahlou-Kassi, A.[Reproductive characteristics of Ethiopian highland sheep. II. Genetic parameters of semen characteristics and their relationships with testicular measurements in ram lambs]Reproductive characteristics of Ethiopian highland sheep. II. Genetic parameters of semen characteristics and their relationships with testicular measurements in ram lambs

The effect of dietary protein supplementation on the resistance of lambs to endoparasites was examined in Horro and Menz lambs artificially infected with Haemonchus contortus. The experimental design involved 2 breeds, 2 infection treatments (infected Vs non-infected) and 3 nutrition treatments. ...


Haile, AynalemTembely, S.Baker, R.L.Anindo, D.O.Mukasa-Mugerwa, E.Rege, J.E.O.Yami, A.[Effect of dietary protein supplementation on the resistance of lambs to artificial infection with haemonchus contortus - preliminary results]Effect of dietary protein supplementation on the resistance of lambs to artificial infection with haemonchus contortus - preliminary results

This study is evaluating the resistance of Red Maasai sheep to endoparasite infections relative to Dorper sheep and a range of Red Maasai x Dorper crosses. The results confirm previous Reports that both Red Maasai ewes and lambs are more resistant to endoparasites (predominantly Haemonchus contor...


Baker, R.L.Mwamachi, D.M.Audho, James O.Thorpe, W.R.[Genetic resistance to gastrointestinal nematode parasites in Red Maasai sheep in Kenya]Genetic resistance to gastrointestinal nematode parasites in Red Maasai sheep in Kenya

Research in Kenya has confirmed that Red Maasai sheep are more resistant to gastrointestinal parasites than Dorper sheep and has shown that Small East African goats are more resistant than Galla goats. There is no difference in resistance between the Menz and Horro sheep breeds in Ethiopia. Herit...


Baker, R.L.Rege, J.E.O.Tembely, S.Mukasa-Mugerwa, E.Anindo, D.O.Mwamachi, D.M.Thorpe, W.R.Lahlou-Kassi, A.[Genetic resistance to gastrointestinal nematode parasites in some indigenous breeds of sheep and goats in East Africa]Genetic resistance to gastrointestinal nematode parasites in some indigenous breeds of sheep and goats in East Africa

Data collected on 3256 lambs born to Horro and Menz breed ewes single-sire mated to 71 rams at the International Livestock research Institute (ILRI) Debre Berhan station between September 1992 and June 1996 were analysed for rates of survival and growth from birth to weaning. A significantly lowe...


Mukasa-Mugerwa, E.Lahlou-Kassi, A.Anindo, D.O.Rege, J.E.O.Tembely, S.Tibbo, MarkosBaker, R.L.[Between and within breed variation in lamb survival and the risk factors associated with major causes of mortality in indigenous Horro and menz sheep in Ethiopia]Between and within breed variation in lamb survival and the risk factors associated with major causes of mortality in indigenous Horro and menz sheep in Ethiopia

Resistance and resilience to naturally acquired gastro-intestinal (GI) nematode parasite infections (predominantly Haemonchus contortus) were studied in 1785 lambs born over six lambings (1991 to 1996) consisting of 212 Red Maasai, 311 Dorper and 1262 crossbred (Red Maasai-Dorper) lambs in the su...


Baker, R.L.Nagda, S.M.Rodríguez Zas, S.L.Southey, B.R.Audho, James O.Aduda, Eric O.Thorpe, W.R.[Resistance and resilience to gastro-intestinal nematode parasites and relationships with productivity of Red Maasai, Dorper and Red Maasai X Dorper crossbred lambs in the sub-humid tropics]Resistance and resilience to gastro-intestinal nematode parasites and relationships with productivity of Red Maasai, Dorper and Red Maasai X Dorper crossbred lambs in the sub-humid tropics

The Menz and Horro highland sheep breeds are being evaluated at the ILCA Debre Birhan research station in Ethiopia for between-and within-breed genetic variation for resistance to internal parasites. The experimental design involve mating, for each breed, 150 ewes with 10 rams to lamb at the begi...


Rege, J.E.O.Tembely, S.Mukasa, E.Sovani, S.Anindo, D.O.Lahlou-Kassi, A.Baker, R.L.[Preliminary evidence for genetic resistance to endoparasites in Menz and Horro lambs in the highlands of Ethiopia]Preliminary evidence for genetic resistance to endoparasites in Menz and Horro lambs in the highlands of Ethiopia

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