A dairy cattle breeding project based on the principles of Nicholas and Smith (1983) is described. The 450 milking cow herd at Ottawa includes 85 Ayrshire based A line, 185 Holstein H line and 180 C line crossbreds from the A and H parental lines. Effects of genotype of embryo, genotype of surrogate dam and their interaction on lifetime performance will be examined with crossbred embryos and Holstein embryos from selected donor cows in the industry at large transferred to A, H and C line recipients. The population derived from the Holstein embryos will be the foundation population for experimental evaluation of the sib-testing breeding scheme. One male from each donor Holstein cow will be reared and selected for breeding use when sibs are in first lactation. Female progeny from transferred embryos will be selected as donors after the second calving. Donor cows and service sires will be selected based on estimated lifetime performance. Performance of progeny of donor cows and breeding bulls from introuuced embryos will be used to evaluates the effectiveness and feasibility of the breeding scheme.

A. J Lee, A. J McAllister, C. Y Lin

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 315–320, 1986
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