Interval from calving to first breeding is regarded as one of the most important practical measures of reproductive performance (Thaller, 1998). Extended intervals may be caused by post-partum metritis, endocrine dysfunction that delays the establishment of regular estrus cycles, and depressed expression of estrus behavior. Undetected estrus is one of the major contributors to extended intervals to first breeding or conception
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.29, 2002
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