Programs for genetic improvement must be based on accurate measures of performance of individual animals. The traits must be measurable and heritable if selection is to be effective. Traits that are measurable early in life and are moderate to high in transmittability are more amenable to rapid progress through selection. Individual merit, based on performance test records, is the most important basis for selection, although information on performance records of ancestors, collateral relatives and the progeny test are valuable aids to individual selection for specific
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 399–404, 1982
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