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In planning and evaluating breeding schemes, a comparison of predicted genetic responses to different selection procedures constitutes a compulsory approach. The asymptotic genetic progress achieved through selection is inversely proportional to generation interval 2). The generation interval can be optimized by selecting the animals with highest breeding values irrespective of their age and accuracy of selection 1). The genes from a specified breeding stock are transmitted to later generations through the stock selected as parents of the next generation. This leads to the expectation that there should be some differences in gene flow between those based on the age structure of parents at mating time and on the number of their progeny actually contributing to the next generation, when the age structure of parents is far from an optimum. The objective of this study was to estimate the bias explicitly between assumed (at mating) and actual parental age structures by computer simulation. The influence of various factors such as genetic trends, accuracy of selection, selection intensity and population size on the bias in age structure (generation interval) were also investigated.

Bias in Parental Age Structure Ascribed to Non-optimized Across the Age Classes Selection in a Dairy Population with Overlapping Generations