Analyses trends in genetic and environemntal components of performance, to estimate levels of inbreeding and to quantify its effects on performance in order to identify which of these factors is responsible for the decline in performance at the Stud. Presents an evaluation of long-term breeding p...
Rege, J.E.O.
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Wakhungu, Judi W.
,
[An evaluation of a long-term breeding programme in a closed Sahiwal herd in Kenya. II. Genetic and phenotypic trends and levels of inbreeding]
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An evaluation of a long-term breeding programme in a closed Sahiwal herd in Kenya. II. Genetic and phenotypic trends and levels of inbreeding
The maximum likelihood parameters estimated in logistic analysis are in terms of a transformation of the original response variable and, although inferences are easily made about the sources of variation in the linearized model using standard procedures applied in regression analysis, the varianc...
Rege, J.E.O.
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Sherington, J.
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[A method for estimating sampling variances of predicted probabilities from maximum likelihood estimates in logit response function]
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A method for estimating sampling variances of predicted probabilities from maximum likelihood estimates in logit response function
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.
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Tembely, S.
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Mukasa-Mugerwa, E.
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Sovani, S.
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Anindo, D.O.
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Lahlou-Kassi, A.
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Nagda, S.M.
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Baker, R.L.
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[Effect of breed and season on production and response to infections with gastro-intestinal nematode parasites in sheep in the highlands of Ethiopia]
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Effect of breed and season on production and response to infections with gastro-intestinal nematode parasites in sheep in the highlands of Ethiopia
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.
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Aboagye, G.S.
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Akah, S.
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Ahunu, B.K.
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[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]
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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.
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Mbah, D.A.
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Rege, J.E.O.
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Oumate, H.
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[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]
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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 method for estimating variance and covariance components for both uncensored and censored traits is described. The paper considers two cases: An uncensored trait and a right-censored trait; and two uncensored traits. A multivariate normal distribution is assumed for these traits and Bayesian ar...
Togashi, K.
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Rege, J.E.O.
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[Maximum likelihood and an approximate expectation and maximization procedures to estimate dispersion parameters in a data set of combination of censored and uncensored traits]
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Maximum likelihood and an approximate expectation and maximization procedures to estimate dispersion parameters in a data set of combination of censored and uncensored traits
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.
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Lahlou-Kassi, A.
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Rege, J.E.O.
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Sovani, S.
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Diedhiou, M.L.
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Baker, R.L.
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[The epidemiology of nematode infections in sheep in a cool tropical environment]
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The epidemiology of nematode infections in sheep in a cool tropical environment
Rege, J.E.O.
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Kahi, A.
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Okomo-Adhiambo, M.
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Mwacharo, Joram M.
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Hanotte, Olivier H.
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[Zebu cattle of Kenya: Uses, performance, farmer preferences, measures of genetic diversity and options for improved use]
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Zebu cattle of Kenya: Uses, performance, farmer preferences, measures of genetic diversity and options for improved use
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.
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Anindo, D.O.
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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]
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Reproductive performance and productivity of Menz and Horro sheep lambing in the wet and dry seasons in the highlands of Ethiopia
Weight of lambs weaned (at 150 days) per ewe per year (Index D, per kg liveweight of ewe per year (Index II), per kg metabolic body weight (W0.73) of ewe per year (Index III), and per lifetime of ewe regardless of ewe weight (Index IV), were computed for 3022 ewes at Malya and West Kilimanjaro re...