The dairy cattle industry of the world has undergone a radical change in technology, systems and structure during the past twenty-five years. Development and effective use of artificial insemination has been a major part of the change. The centralization of dairy bull insemination and progeny testing units, the evolution of milk recording and computerized sire evaluation methods, and a recognition of the tremendous genetic and economic impact of properly proven dairy sires has stimulated considerable research to determine breeding schemes that optimize the improvement of cattle.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 611–618, 1974
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