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Effect of Estrus Synchronization using AVIKESIL-S® with eCG on the Reproductive Efficiency in Crossbred Ewes

Vinay Yadav R. K. Chandolia Ravi Dutt Amarjeet Bisla Gitesh Saini and Gyan Singh
Vol 10(3), 49-59

The present study was designed to investigate the efficacy of the cheaper intra-vaginal progesterone releasing sponge (AVIKESIL-S®) and eCG (Equine chorionic gonadotropin) estrus synchronization protocol on the reproductive traits in crossbred ewes. A total of 30 ewes were randomly divided into two groups (n=15 in each group), control and treatment, after initial examination for non-pregnancy. Prior to selection of ewes for estrus synchronization, pre-synchronization was done using double prostaglandin (PG) protocol. AVIKESIL-S® (Intra-vaginal sponge with 350 mg natural progesterone designed by ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India) was inserted for 12 days with 200 IU eCG intramuscular (IM) on the day of sponge removal to the animals belonging to treatment group. Blood sampling was carried out for estimation of plasma progesterone concentration in due course of study. Trans-rectal real-time B-mode ultrasonography was done for early pregnancy diagnosis at day 25 post-mating with reconfirmation on day 45. The results of the present study showed that the protocol was highly effective in induction of estrus resulting in better pregnancy rate and subsequent fertility in treated animals. The fecundity (%) was significantly greater (P<0.05) in treated group than control. The progesterone concentration did not vary significantly between both groups (P>0.05) on day 14, 25 and 45 post-mating. Thus, the protocol could be advised for improvement of fertility and reproductive efficiency in crossbred ewes.

Keywords : AVIKESIL-S® eCG Ultrasonography Reproductive Efficiency Sheep

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