Losses due to fertility are still among the most serious economic problems of dairy cattle. In fact, little progress has been made in reducing them except through the control of Brucillosis. However, any gains made may have been offset by the great expansion of herd size without a corresponding increase in manpower, reducing the intensity of close management in observing heat and timing in breeding. In a study (previously not published) in Massachusetts of A,000 cows in k2 herds in 1975 which had monthly veterinarian herd checks over four years, it was found that about onerfourth of all cows were culled for reproductive troubles, close to the national average (Berger et al 1980), with the major factor being repeat breeders causing one sixth of all the cows to be culled.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 529–534, 1982
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