Abstract

The risk of breeding schemes comprises the variance of the selection response and the inbreeding. Both are high in modem breeding schemes, and can be reduced by including them with a cost factor in the breeding objective. The cost factors of inbreeding and variance of the selection response are however difficult to derive, and a more practical solution may be to set a constraint on the inbreeding and/or the variance of the selection response. Including a cost factor in the breeding objective, can lead to large reductions of inbreeding and/or variance of response with little reduction in genetic gain. At the same rate of inbreeding, a constraint on breeding can result in a up to 60% higher selection response, than conventional selection for BLUP estimated breeding values. With overlapping generations an increase in response of 28% was found. K e y w o r d s : Breeding Schemes, Risk, Inbreeding, Long-term Selection Response
 

Theo HE Meuwissen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 25: Lactation; growth and efficiency; meat quality; role of exotic breeds in the tropics; design of village breeding programmes;, , 347–354, 1998
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