The present study was designed to investigate the effects of PGF2α or GnRH injections during postpartum on uterine involution, length of postpartum period, number of services per conception, days open and calving interval in cross-bred Sudanese dairy cows. The findings of this experiment explained that the injection of GnRH significantly shortens the time needed for uterine involution, postpartum period, days open and calving interval as compared with control (P
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