For centuries, man has been exerting a process of selection on animals and plants trying to modify certain characters. This mass selection is based in the election of the individuals of both sexes to be used for reproduction. In dairy cattle, since we need much fewer males than females for reproduction purposes, the bull has always been considered as playing a key role in improvement by selection. This role has still been increased since the establishment of Artificial Insemination as a common procedure. A. I. has had a tremendous impact on animal breeding, and has increased the necessity for above average or proven sires. Thus, the paramount importance of the election of sires, since the sire chosen may leave thousands of offspring every year.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2, Madrid, Spain, 119–128, 1974
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