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Kahi, A.K.Thorpe, W.R.Baker, L.[Estimates of heritabilities and genetic and phenotypic correlations for preweaning traits of calves in a crossbred dairy herd in coastal lowland Kenya]Estimates of heritabilities and genetic and phenotypic correlations for preweaning traits of calves in a crossbred dairy herd in coastal lowland Kenya

Direct and maternal (co)variance components and genetic parameters were estimated for growth and reproductive traits in the Kenya Boran cattle fitting univariate animal models. Data consisted of records on 4502 animals from 81 sires and 1010 dams collected between 1989 and 2004. The average numbe...


Wasike, C.B.Indetie, D.Ojango, Julie M.K.Kahi, A.K.[Direct and maternal (co)variance components and genetic parameters for growth and reproductive traits in the Boran cattle in Kenya]Direct and maternal (co)variance components and genetic parameters for growth and reproductive traits in the Boran cattle in Kenya

Bio-economic profit models were developed and applied to evaluate biological and economic variables that characterize production systems utilizing the Boran breed. Production systems were described according to their sale age (24 months short-fed or 36 months long-fed), levels of input (low, medi...


Rewe, T.O.Indetie, D.Ojango, Julie M.K.Kahi, A.K.[Breeding objectives for the Boran breed in Kenya: model development and application to pasture-based production systems]Breeding objectives for the Boran breed in Kenya: model development and application to pasture-based production systems

Economic values for production (sale weight in steers, SWs, kg and heifers, SWh, kg; dressing percentage, DP; consumable meat percentage, CMP and milk yield, MY, kg) and functional (cow weight, CoWT, kg; cow survival rate, CoSR, %; postweaning survival rate, PSR, %; feed intake of cows, FIc, heif...


Rewe, T.O.Indetie, D.Ojango, Julie M.K.Kahi, A.K.[Economic values for production and functional traits and assessment of their influence on genetic improvement in the Boran cattle in Kenya]Economic values for production and functional traits and assessment of their influence on genetic improvement in the Boran cattle in Kenya

The predicted performance of nine crossbreeding strategies for milk production and reproductive traits and cow live weights (LW) were compared. The strategies were selected because of their superiority to many others. The data were from crosses of Ayrshire (A), Brown Swiss (B), Friesian (F) and S...


Kahi, A.K.Nitter, G.Thorpe, W.R.Gall, C.F.[Crossbreeding for dairy production in the lowland tropics of Kenya. II. Prediction of performance of alternative crossbreeding strategies]Crossbreeding for dairy production in the lowland tropics of Kenya. II. Prediction of performance of alternative crossbreeding strategies

A total of 1443 records were used to estimate individual and maternal additive genetic breed and heterotic effects for preweaning growth and survival traits of crosses of Ayrshire (A), Brown Swiss (B), and Sahiwal (S) in a dairy herd in the lowland coastal tropics of Kenya. Individual and matern...


Kahi, A.K.Mackinnon, M.J.Thorpe, W.R.Baker, R.L.Njubi, D.[Estimation of individual and maternal additive genetic and heterotic effects for preweaning traits of crosses of Ayrshire, Brown Swiss and Sahiwal cattle in the lowland tropics of Kenya]Estimation of individual and maternal additive genetic and heterotic effects for preweaning traits of crosses of Ayrshire, Brown Swiss and Sahiwal cattle in the lowland tropics of Kenya

Crossbreeding parameters for milk production and reproductive traits and for cow live weight (LW) of crosses of Ayrshire (A), Brown Swiss (B), Friesian (F) and Sahiwal (S) cattle were estimated using data from a dairy herd in the lowland coastal tropics of Kenya. An individual animal model was fi...


Kahi, A.K.Thorpe, W.R.Nitter, G.Baker, R.L.[Crossbreeding for dairy production in the lowland tropics of Kenya. I. Estimation of individual crossbreeding effects on milk production and reproductive traits and on cow live weight]Crossbreeding for dairy production in the lowland tropics of Kenya. I. Estimation of individual crossbreeding effects on milk production and reproductive traits and on cow live weight

The aim of the current simulation study was to maximise the amount (kg) of high value meat arising from surplus males and females per kilogram of the goat population and, maximise weight gains to turnoff age. Subsequently, the study aimed to decrease turnoff age, maximisation of reproduction rate...


Mbuku, S.M.Okeyo Mwai, AllyKosgey, I.S.Kahi, A.K.[Optimum crossbreeding systems for goats in low-input livestock production system in Kenya]Optimum crossbreeding systems for goats in low-input livestock production system in Kenya

Data on accumulated life performance of crosses of Ayrshire (A), Brown Swiss (B), Friesian (F) and Sahiwal (S) cattle collected over a 21- years period from a dairy ranch in the lowland tropics of Kenya were analysed to estimate additive and non-additive genetic effects of economic traits. These ...


Kahi, A.K.Thorpe, W.R.Nitter, G.Arendonk, Johan A.M. vanGall, C.F.[Economic evaluation of crossbreeding for dairy production in a pasture based production system in Kenya]Economic evaluation of crossbreeding for dairy production in a pasture based production system in Kenya

his study evaluated alternative breeding objectives and schemes for crossbred goats in a village/ community breeding program. A single-tier breeding structure was assumed in the optimisation of this breeding program. Considered were two selection schemes; within-group (WG) and across-groups (AG),...


Bett, R.C.Okeyo Mwai, AllyKosgey, I.S.Kahi, A.K.Peters, Kurt J.[Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs]Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs

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