Abstract
Follicular development and reproductive hormone changes during postpartum anestrus in suckled beef cows (1991)
Highlights
Duration of postpartum anestrus determines when and if cows rebreed following calving, both of which heavily influence the profitability of beef cow/calf production
Follicular growth occurred in waves during this period in cows that were in adequate body condition and adequately fed, and follicular development appeared to be related to serum concentrations of luteinizing hormone and estradiol
Two distinct characteristics were associated with follicular development before the first postpartum ovulation
Summary
Duration of postpartum anestrus determines when and if cows rebreed following calving, both of which heavily influence the profitability of beef cow/calf production. In terms of reproductive management, this period still presents problems for many producers. A better understanding of the events and mechanisms responsible for initiating the return to cyclicity after calving is needed before recommendations or programs can de developed that will help beef producers better manage this economically important period. Our objectives were to determine the patterns of follicular growth and relate those patterns to changes in reproductive hormone from calving to the first postpartum ovulation in suckled beef cows
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