Population size and selection pressures

When working with recurrent mass selection, the rate of progress (i.e., the rate of genetic advance) depends very heavily on both the size of the screening population, and the selection pressures exerted on it. The larger the population, and the stronger the selection pressures, the more rapid the breeding progress. Both the size of the screening population, and the intensity of the selection pressures exerted on it, should be given top priority, usually at the expense of many labour-intensive activities that are necessary in pedigree breeding but unnecessary in recurrent mass selection.

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