In applying quantitative genetics theory to problems of animal improvement, the aim is to maximise the rate of improvement per unit of time. The theory is developed in terms of the variance of the characters under selection, the basic concept being the heritability, the proportion of the total phenotypic variance due to additive gene effects. From this central concept and the known rules of Mendelian segregation, we can derive the expected correlation between, for instance, the performance of an animal and its breeding value or between the performance of related animals. For most of the time, we can stay at this level and deal with individual genes vary rarely. Much of our efforts are then devoted bo the optimum use of the available information.
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., , 32–41, 1986
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