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Genetic evaluation of breeding strategies for improvement of dairy cattle in Kenya

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Abstract

A deterministic approach was used to compare breeding strategies utilizing local and imported semen for improvement of dairy cattle in Kenya. The local selection programs considered were a closed progeny testing scheme (CPT) and a young bull system progeny of local bulls (PLB). The continuous semen importation (CSI) and young bull system progeny of imported bulls (PIB) were the strategies based on imports. The breeding strategies were compared on the basis of selection response. The effect of genetic correlation (r g) and initial differences in genetic merit between the two populations was also examined. The CSI and PIB strategies ranked above CPT by, correspondingly, 35.1% and 25.0% when the r g between Kenya and the USA was assumed to be one. At a r g of 0.58, imports from countries which are 1.50 standard deviation (SD) above the local population were superior to CPT but equal to PLB. This means that if CSI is to be used at a r g of 0.58, then only semen from countries which are >1.50SD should be imported. At a r g of 0.70 and with an initial genetic difference of 1.25SD, the economic responses in CSI and PLB were equal. This indicates that semen importation is only justified when genotype–environment interaction is >0.70. It is concluded that wholesale importation of semen as a means of achieving sustainable genetic progress in Kenya is a less optimal solution and there is the need for an effective local selection program.

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Abbreviations

CPT:

Closed progeny testing scheme

CIS:

Continuous semen importation

EV:

Economic values

GE:

Genotype–environment interaction

PLB:

Young bull system progeny of local bulls

PIB:

Young bull system progeny of imported bulls

rg :

Genetic correlation

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Acknowledgements

We acknowledge Egerton University, Njoro, Kenya for provision of support and facilities.

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Authors and Affiliations

  1. Animal Breeding and Genetics Group, Department of Animal Sciences, Egerton University, P.O. Box 536, 20115, Egerton, Kenya

    Tobias O. Okeno, Isaac S. Kosgey & Alexander K. Kahi

  2. Institute of Animal Breeding in the Tropics and Sub-Tropics, Humboldt University of Berlin, Philippstraße 13, 10115, Berlin, Germany

    Tobias O. Okeno

Authors
  1. Tobias O. Okeno
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  2. Isaac S. Kosgey
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  3. Alexander K. Kahi
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Correspondence to Alexander K. Kahi.

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Okeno, T.O., Kosgey, I.S. & Kahi, A.K. Genetic evaluation of breeding strategies for improvement of dairy cattle in Kenya. Trop Anim Health Prod 42, 1073–1079 (2010). https://doi.org/10.1007/s11250-010-9528-z

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