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Ruminants adapt to periodic fluctuation in feed resources by accumulating fat stores during favourable periods. Thus, genetic variations, among ruminant genotypes, in the capa city to deposit fat could be exploited through breeding to improve animal productivity in traditional tropical production...


Ermias, E.Yami, A.Rege, J.E.O.[Fat deposition in tropical sheep as adaptive attribute to periodic feed fluctuation]Fat deposition in tropical sheep as adaptive attribute to periodic feed fluctuation

Crossbreeding data involving Ghana Shorthorn, Sokoto Gudali and their Jersey F1S and backcrosses collected over a 16-year period were analysed to estimate additive and heterotic effects for milk production, reproduction and calf growth traits. Sokoto Gudali was significantly better than Ghana Sho...


Rege, J.E.O.Aboagye, G.S.Akah, S.Ahunu, B.K.[Crossbreeding Jersey with Ghana Shorthorn and Sokoto Gudali cattle in a tropical environment: Additive and heterotic effects for milk production, reproduction and calf growth traits]Crossbreeding Jersey with Ghana Shorthorn and Sokoto Gudali cattle in a tropical environment: Additive and heterotic effects for milk production, reproduction and calf growth traits

Genetic parameters for birth and 240-day weaning weights in Gudali and Wakwa cattle breeds in a tropical environment in Cameroon were estimated by derivative-free restricted maximum likelihood procedure using single-trait animal models with maternal effects. Performance data covered the period 19...


Tawah, C.L.Mbah, D.A.Rege, J.E.O.Oumate, H.[Genetic evaluation of birth and weaning weight of Gudali and two-breed synthetic Wakwa beef cattle populations under selection in Cameroon: Genetic and phenotypic parameters]Genetic evaluation of birth and weaning weight of Gudali and two-breed synthetic Wakwa beef cattle populations under selection in Cameroon: Genetic and phenotypic parameters

A total of 147 Menz and Horro lambs of both sexes were serially slaughtered and dissected at five different stages of growth to define the pattern of growth and partitioning of fat among body depots in indigenous Ethiopian Menz and Horro sheep breeds. The GLM procedure of SAS and allometric growt...


Negussie, E.Rottmann, O.J.Pirchner, F.Rege, J.E.O.[Patterns of growth and partitioning of fat depots in tropical fat-tailed Menz and Horro sheep breeds]Patterns of growth and partitioning of fat depots in tropical fat-tailed Menz and Horro sheep breeds

Individual and maternal additive genetic and heterotic effects were estimated for preweaning, reproductive, and lactation traits of the Sahiwal breed and its crosses with Bos taurus (Ayrshire and Friesian). The individual additive genetic breed effect influenced all cow traits except annual milk ...


Thorpe, W.R.Kang'ethe, P.Rege, J.E.O.Mosi, R.O.Mwandotto, B.A.J.Njuguna, P.[Crossbreeding Ayrshire, Friesian, and Sahiwal cattle for milk yield and preweaning traits of progeny in the semiarid tropics of Kenya]Crossbreeding Ayrshire, Friesian, and Sahiwal cattle for milk yield and preweaning traits of progeny in the semiarid tropics of Kenya

DNA samples from 30 Friesian, 18 N'Dama, 30 Sahiwal and 18 Barotse (derived from Bos taurus and B. indicus) cattle were amplified by the polymerase chain reaction using previously described primer sequences for amplification of the Y chromosome locus INRA124. A polymorphism with 2 alleles was det...


Hanotte, Olivier H.Okomo, M.Verjee, Y.Rege, J.E.O.Teale, A.J.[A polymorphic Y chromosome microsatellite locus in cattle]A polymorphic Y chromosome microsatellite locus in cattle

Evaluates the reproductive and lactational performances, length of productive life of the Jersey breed from records for 1960 to 1988 in coastal lowland semi-humid Kenya. Reports estimates of reproductive and lactational performance, the effects of non-genetic factors on performance and estimates ...


Njubi, D.M.Rege, J.E.O.Thorpe, W.R.Collins-Lusweti, E.Nyambaka, R.[Genetic and environmental variation in reproductive and lactational performance of Jersey cattle in the coastal lowland semi-humid tropics]Genetic and environmental variation in reproductive and lactational performance of Jersey cattle in the coastal lowland semi-humid tropics

Sustainable livestock improvement cannot be guaranteed for most tropical areas of the world without utilization of the evolutionary adaptation of the indigenous livestock breeds. The paper summarizes the adaptive traits of indigenous tropical breeds, presents a case for their evaluation and discu...


Baker, R.L.Rege, J.E.O.[Genetic resistance to diseases and other stresses in improvement of ruminant livestock in the tropics]Genetic resistance to diseases and other stresses in improvement of ruminant livestock in the tropics

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