STUDY ON THE UTILIZATION OF CIDR, PMSG AND PGF2 TO STIMULATE FIRST ESTRUS AND TO IMPROVE ARTIFICIAL INSEMINATION EFFICIENCY IN SWAM BUFFLOES

Abstract

40 healthy heifers buffalo at 32 – 33 months of age that have not been in heat were allocated into 2 experimental groups. Group 1 without interference of reproductive hormone, the estrous  was monitored naturally and artificial insemination was performed; Group 2 was induced with reproductive hormone by intra-vaginal placement of CIDR (at day 0), after 7 days of intra-vaginal CIDR placement animals were injected with 1.000IU PMSG and  25mg PGF₂α; at day 10, CIDR was removed, animals were monitored for estrous and then perform A.I. Animals in both groups were double A.I. with Murrahi frozen straw semen; the first A.I. was performed after buffaloes in heat for about 10 – 12 hrs, the A.I. performance interval was 6 hrs.

The results showed that, there was 85.00% animals in group 1 in heat at 38.38 months of age and the conception rate after double A.I. was 52.00%; for the group 2, there was 70.00% animals at 32 – 33 months of age, in heat after 4 days of  hormone treatment and the conception rate was 60.00% after double A.I. Thus, hormone treatment in buffaloe had shortened the first eutrus age by 5.38 – 6.38 months, and increased the conceive rate by 8.00%.