Closed adult MOET nucleus schemes with discrete generations of single trait selection were investigated using Monte Carlo simulation. Simulated rates of response and inbreeding ranged from 0.17-0.35 phenotypic standard deviations and 3.2-9.3% per generation respectively. Simple predictors, assuming base generation variances and large population sizes, overestimated responses by 40-67%. More realistic predictors, accounting for the effects of finite numbers, inbreeding and selection, were within 4% of the simulated responses. The benefits of alternative breeding strategies were described. Factorial mating designs increased response while the use of more than one male from a selected sibship reduced inbreeding. The combination of these two strategies increased response and reduced inbreeding.

J. Ruane, R. Thompson

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 275–278, 1990
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