Management of Postpartum Reproductive Performance with Administration of GNRH or PGF2α in Cross Bred Dairy Cows

The present study was conducted to investigate the influence of administration ofGnRH orPGF2α during early postpartum (PP) on uterine involution (UI), postpartum period (PPP), days open (DP) number of services per conception and calving interval (CI) in cross-bred dairy cows. A total of 45 cross-bred dairy cows (4 – 8 years) were recruited to determine the influence of administration of GnRH orPGF2αduring early PP on the above mentioned traits. The cows were divided randomly into three equal groups A, B and C (15 cows each). Group A and B were injected intra muscularly (i.m) withGnRH orPGF2α 200 microgram and 500 microgram respectively on day 21 PP. while cows in group C were employed as untreated control. The result of the current study showed that injection of GnRH or PGF2αthree week post calving had no significant difference on the time taken for UI compared to the control. However, the PPP of cows treated either with GnRH orPGF2αas early as 21 days PP was significantly (P < 0.005) shortened when compared to the control. The number of services per conception was significantly (P < 004) improved for the treated cows as compared to the control.Moreover, the DO and CI were significantly (P < 001) minimized compared to the control. It is concluded that the PP reproductive performance in dairy cows could be managed with injection of GnRH or PGF2αas early as three weeks Reproductive trait, postpartum, GnRH, PGF2α , Dairy cow