Of cows that had luteal regression, 92% were detected in estrus. Neither day of the estrous cycle at PGF2á (d 6 to 9, 10 to 13, or 14 to 18; P = 0.56), replicate (P = 0.98), nor the interaction (P = 0.33) influenced the percentage of cows with a
functional CL that regressed after PGF2á.