Milk recording, artificial insemination and computers have given the dairy cattle industry an effective combination of tools for genetic improvement. Selection theory (Robertson and Rendel, 1950) indicates that annual gains of 1.5 to 2.0% of the mean should be possible.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 141–152, 1986
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