Abstract:For the timed re‐insemination at the minimal interbreeding interval, cows were treated with a progesterone (P4)‐releasing intravaginal device from Days 13–15 to 21 post‐insemination (Day 0 = estrus), followed by plasma P4 assay on Day 23 and then subjected to the Experiments 1 and 2. In Experiment 1, of 18 cows, 6 cows were determined as luteolysis with low (<1 ng/ml) plasma P4 concentrations on Day 23 and ovulated on Days 24 (3 cows), 25 (1 cow), and 26 (1 cow) except a cow affected by ovarian quiescence. In … Show more
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