Abstract
A protocol to make anestrous cows more likely to cycle prior to estrous synchronization would greatly enhance reproductive efficiency. Ease of application, availability, and low cost make feeding melengestrol acetate (MGA) a good choice in such a protocol. MGA, used as a progestin “primer,” has no detrimental effects on cows that are already cycling and reduces the number of cows expressing short cycles.
Highlights
Fifteen to twenty percent of the nation’s cows fail to wean a calf annually, primarily because they do not become pregnant within the relatively short breeding season
The purpose of our experiments was to test a protocol that would “progestin-prime” multiparous beef cows so that all would be cycling at the start of the breeding season
Experiment 1 Blood samples revealed 20.5% of cows were cycling 30 days prior to the beginning of the breeding season
Summary
A protocol to make anestrous cows more likely to cycle prior to estrous synchronization would greatly enhance reproductive efficiency. Availability, and low cost make feeding melengestrol acetate (MGA) a good choice in such a protocol. MGA, used as a progestin “primer,” has no detrimental effects on cows that are already cycling and reduces the number of cows expressing short cycles
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