The advent of across-flock genetic evaluation gives a basis for more properly designed multiflock breeding programs, with possibility for running geographically dispersed nucleii. It also encourages migration of breeding stock for assessment of outside sources of genetic material. This paper uses a mixed model approach to test the accuracy of estimating base flock genetic means as a function of migration policy. The levels of migration operating within a 2-tier open nucleus scheme are shown to give very good connection between flocks, as might be expected, with little apparent scope to modify these to improve overall genetic gain. However, it is suggested that special attention to migration between different breeding pyramids is warranted. An approach is proposed for combining all animal breeding issues, such as selection, connection and assortative mating, into a single index framework.

Brian P Kinghorn, R. K Shepherd

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 7–16, 1990
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