EVALUATION OF ESTRUS SYNCHRONIZATION WITH DIFFERENT DOSES OF PROSTAGLANDIN F2α IN NELLORE JODIPI EWES
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Date
2015-10
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P) INDIA
Abstract
ABSTRACT:
The present investigation was undertaken to synchronize Nellore Jodipi cyclic ewes to compare the effectiveness of two doses of double PGF2α (Cloprostenol sodium) @ either 125 or 250 μg with 9 d interval in Group I and Group II ewes to assess the estrus response and fertility rate after timed AI. Estrus response was assessed by apronised rams for a period of 1 h at 6 h interval between 24 to 72 h from the time of 2nd PGF2α administration. All the ewes were inseminated twice intra cervically at 60 and 72 h after 2nd PGF2α administration. The estrus response (%), onset of estrus (%), duration of estrus (h) and intensity of estrus in ewes synchronized by prostaglandin F2αwere 80.95 and 85.71; 50.94+3.12 and 48.00+3.40; 24.35+1.41 and 28.22+1.15 and 6.76+0.29 and 6.83+0.34 in Group I and II, respectively. The mean serum progesterone concentrations on various days of synchronization i.e., on day of first PGF2α, on day of second PGF2α, on day of insemination and on the day 18 post insemination were 4.68+0.31 and 3.12+0.19; 2.45+0.14 and 4.02+0.30; 1.47+0.12 and 1.15+0.10 and 5.12+0.18 and 5.49+0.13 ng/ml in Group I and Group II, respectively. The conception rate based on 25 d non return rate was 85.71 and 80.95 % with an overall lambing rate of 71.43 and 66.67 % in Group I and II, respectively. The present study has revealed that Nellore Jodipi ewes can be synchronized by 125 and 250 μg of double PGF2α (Cloprostenol sodium) with 9 d apart with satisfactory results. But the synchronization response among 42 Nellore Jodipi ewes by 125 μg of PGF2𝛼 was slightly lesser but the lambing rate was higher and non-significant than 250 μg of PGF2𝛼.
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