SYNCHRONIZATION OF ESTRUS IN SIROHI AND JAMNAPARI GOATS OUTSIDE THE BREEDING TRACT AND ITS EFFECT ON REPRODUCTIVE PERFORMANCE: A FIELD STUDY
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Date
2020-06-01
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
The objective of the present study was to assess the effectiveness of short-term
protocols (7 days) or Ovsynch for the synchronization of estrus in Sirohi and Jamnapari
goats, using Avikesil-S or Ovsynch treatments. Fifty adult Sirohi and Jamnapari does each
were divided into four equal treatment groups, viz., (i) Group I (N=10) received 350 mg of
natural progesterone intravaginal sponges (7 days) + on day of sponge withdrawal 400 IU
eCG (ii) Group II (N=10) received 350 mg of natural progesterone intravaginal sponges (7
days) + on day of sponge withdrawal 125 μg PGF2α (iii) Group III (N=10) received 350
mg of natural progesterone intravaginal sponges (7 days) + on day of sponge withdrawal
400 IU eCG and 125 μg PGF2α (iv) Group IV (N= 10) received a GnRH (Day 0), PGF2α
(Day 5) and a second dose of GnRH (Day 7) (v) Group V (N=10) similar to group III in
addition 500 IU of hCG injected on 5th day post mating. Does were checked for estrus and
hand mated. Breed did not have significant effect on any of the estrus and fertility
parameters recorded. However, different synchronization protocols have significant effect
on interval to estrus, duration of estrus, litter size, type of birth and birth weight. Overall
estrus induction rate, conception rate, pregnancy rate, gestation length, kidding rate and
Sex ratio of both the breeds did not differ significantly among the different synchronization
protocols. Plasma progesterone concentration had significantly increased on 7 days after
Avikesil-S insertion and on the day of estrus, its level decreased to basal level in all
treatment groups. Administration of hCG five days after estrus significantly increased the
plasma progesterone level on 10 days after estrus, but didn’t significantly improved fertility
rate. The results of present study indicated that goats in Group III, showed reduced time to
onset of estrus, higher estrus response, fecundity, prolificacy, and fertility of Sirohi and
Jamnapari does as compared to other treatment groups under local environmental
conditions.