The genetic progress in one generation in a population under selection equals the average genetic superiority of individuals selected to be parents, above the population mean. This superiority is determined by the genetic standard deviation in the population, and the intensity and accuracy of selection. If these parameters are known, the rate of genetic change can be predicted already from the structure of the breeding programme. The intensity and accuracy of selection, as well as the generation interval, are often different for males and females. The genetic selection differentials and the generation lengths must therefore be estimated separately for each of the four paths along which the inheritance is transmitted from one generation to the next (R en d e l & R o b er tso n, 1950).

O. Syrstad

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 603–610, 1974
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