Results are reviewed from the cattle Germ Plasm Evaluation Program at the Roman L. Hruska U.S Meat ANimal Research Center comparing performance of top-crosses by 20 sire breeds. The variation that exists in biological traits important for beef production is vast and under a high degree of genetic control. Significant genetic change can result from 1) selection among breeds, 2) use of crossbreeding to exploit heterosis and 3) selection within breeds.
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., , 271–282, 1986
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