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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