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Optimising two-stage independent culling selection in tree and animal breeding

โœ Scribed by P. P. Cotterill; J. W. James

Publisher
Springer
Year
1981
Tongue
English
Weight
443 KB
Volume
59
Category
Article
ISSN
0040-5752

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โœฆ Synopsis

Theory is given for a simple practical method of predicting gain from two-stage independent culling, where stage 1 of selection is for individual performance and stage 2 is for either progeny performance only, or an index combining individual and progeny performance. Expected gain is determined as a direct function of heritabilities, genetic correlations, selection intensities and progeny-testing capacity. Results show the effect these parameters can have on proportions selected at each stage and, if multiple selection criteria are used, traits selected for first. Methods are discussed in the context of tree and animal breeding, with an example taken from forestry.

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The maintenance of reproductive fitness in lines subjected to artificial selection is one of the major problems in animal breeding. The decline in reproductive performance has neither been predictable from heritabilities and genetic correlations, nor have conventional selection indices been adequate