This study represents the first analysis of the structural changes occurring in a commercial population following the implementation of Optimal Contribution (OC) selection. It was shown that after OC selection, the estimated Mendelian sampling term (â) becomes an important determinant for whether an individual made a long-term genetic contribution (r) to the population, as well as for determining the magnitude of that contribution. This provides the first practical validation of published theoretical predictions, in particular that the selective advantage underlying OC is derived from the inclusion of â for making selection decisions. This validation is important as genomic evaluation will increase accuracy, in part through greater accuracy of â and demonstrates that genomic evaluation combined with OC has the potential to deliver more genetic gain for the same rate of inbreeding.

David M Howard, Ricardo Pong-Wong, Pieter W Knap, Valentin D Kremer, John A Woolliams

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Breeding objectives, economics of selection schemes, and advances in selection theory, , 024, 2014
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