Since most food-producing animals can divide each ejaculate into numerous insemination doses, one sire may be used to breed a very large number of females, leading to the adoption of Artificial Insemination as a method of genetic improvement. As a result, there are less sires required overall, which increases the amount of selection that can be done on the male side. Only the top 1% of dairy cows are chosen as possible bull mothers, and only the top 1% to 3% of their male offspring go on to become the sires of the following generation. Even if the selection intensity in beef cattle and pigs is not quite as high, it is still significantly higher than what can be attained through spontaneous breeding.
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