Ovarian luteal category at the time of exogenous progesterone treatment alters pre-ovulatory follicle size and pregnancy outcome but not initial GnRH treatment in repeat-breeder crossbred dairy heifers submitted to the 7-day fixed-time AI protocol.

Association among ovarian CL characteristics at the time of exogenous P4 treatment, plasma P4 concentrations, and LF size on the day of the fixed-time AI Plasma P4 concentration prior to the start of the exogenous P4 treatment on day 0 displays an increasing trend with increase in CL diameter on day 0 ( r = 0.845 and p < 0.001; Fig. 2 a).

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