Exploratory Animal and Medical Research, West Bengal Veterinary Alumni Association
Abstract
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
