Methods to detect structural differences in specific genes provide qualitative inform ation on the nature o f genetic differences in dairy cattle. Using inform ation on genotypes determ ined by techniques used to investigate m olecular biology has been suggested to im prove selection accuracy fo r you n g anim als prior to perform ance recording or progeny information. Current evidence w ou ld suggest that structural differences are available as marker genes and that at least som e of these differences are related to quantitative traits. Estimates o f the size of these quantitative differences and statistical models to incorporate this data for maximum selection gains are needed.

M. R Dentine

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 35–44, 1990
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