. One cow in replicate 2 in the drylot group was excluded from analyses because of a split estrus (2 mounts received within 14 min, then over 18 h with no mounts, followed by 3 mounts in 2 h). Two cows in replicate 1 and 10 cows in replicate 2 had normal luteal function at PGF2α (progesterone >1 ng/mL) followed
by luteal regression (progesterone