Crossbreeding the poorest cows in dairy herds to bulls with superior beef characters is a recognized method, for improving of the efficiency of the combined production of milk and beef. The ec-conomic advantages of beef - dairy crossbreeding have been demonstrated by model calculations, (Anderson and Lindhe 1972, Cunninq- ham 1974 a . o . ).
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 469–481, 1982
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