Use of Placentrex to Augment Fertility in Repeat Breeder Cross Bred Cows

Abstract

The study was conducted on 20 healthy, parous, cyclic cross bred cows which were brought to the
Gynaecological unit of Veterinary College and Research Institute Hospital, Namakkal, Tamil Nadu-637
002 with the history of repeat breeding. They were randomly divided in to two groups of 10 animals each.
The first group was used as control and the second group was ·treated with IO ml of placentrex,
intramuscularly. Both the groups were inseminated twice at 24 hours interval during estrus. The mean
duration of estrus was 28. 90 ± 0.41 and 24. 70 ± 0.32 h in control and placentrex administered groups,
· respectively, which was significantly shorter (P< 0.05) in placentrex administered group when compared
with the control group. The proportion of intense, intermediate and weak estrus was 30, 40 and 30 per cent
in treated group and 20, 40 and 40 per cent in control group, respectively, which was significantly
different. The mean length of oestrous cycle in non-conceived cows of treated and control group was 22.25
± 0.41 and 22.00 ± 0.64 days, respectively, which was not significantly different. The first service
conception rate was 60 and 30 per cent in treated and control groups, respectively, which was significantly
higher (P> 0.05) in the placentrex treated group than the control group.