CONCEPTION RATE IN POSTPARTUM COW USING CIDR ALONG WITH UTERINE ECBOLICS

A rapid postpartum uterine involution process followed by the early onset of cyclic ovarian activity is of paramount importance for achieving a continuous intensive reproduction in cows.Thirty six (36) normally calved pluriparous Holstein Friesian crossbred cows were equally divided into 4 experimental groups viz. groups I, II, III and IV (control). On day 2 postpartum, the animals of the group I were treated with an intramuscular injection of 25 mg PGF2 α, group II with 50 IU oxytocin, group III with 5 mg methyl ergometrine maleate and group IV with 5 ml normal saline. All the cows of four groups were inserted with Controlled Internal Drug Release device on day 45-55 postpartum intravaginally and left in situ for 9 days along with an intramuscular injection of 25 mg of PGF2 α 24 hours before the withdrawal of CIDR. At 48 and 72 hours of CIDR withdrawal, timed artificial insemination (TAI) using frozen thawed semen was performed to all the cows. The first service, second service and overall first and second service conception rates were 44.44, 22.22 and 66.66 in group I; 11.11, 33.33 and 44.44 in group II; 22.22, 33.33 and 55.55 in group III and 11.11, 22.22 and 33.33 in group IV, respectively. Among the treatment groups, quicker uterine involution and higher overall conception rate were noticed in group I cows.