Vol. 10, Special Issue 5 (2021)

Author(s):
Suhas Suresh, Sahadev Annayappa, Narasimhamurthy, Narayana Swamy Muniyappa, Guruprasad Rachaiah, Santhosh Chickaankadahalli Ramachandra, Suchitra Bidare Raju and Rashmi Srinivas

Abstract:
A study was conducted to compare the efficacy of short-term progestagen and PGF2α with PMSG or GnRH analogue or both for estrus synchronization in Hassan ewes. Thirty nonpregnant ewes received Avikesil-S intravaginal sponge for 7 days followed by 125 μg cloprostenol on day of sponge retrieval. On the day of sponge removal, Group I (n=10) ewes received 300 IU PMSG; Group II (n=10) ewes received 4 μg buserelin actetate, 36 h thereafter, whereas Group III (n=10) ewes received both 300 IU PMSG and 4 μg buserelin acetate 36 h as in other groups and proven rams were used to detect estrus and for mating. The ewes were monitored and pregnancy was diagnosed using ultrasonography on day 30 post mating. Cent per cent sponge retention with 90 per cent estrus response was obtained in all groups. The interval to estrus in Group II was significantly higher (p< 0.05) followed by Group I (32.00 ± 2.00 h) and Group III (30.67 ± 2.11 h). The conception rate was higher (77.77%) in Group I compared to Group II (55.55%) and Group III (66.66%) with no significant difference. It can be concluded that short term Avikesil-S sponge treatment was efficient in Hassan breed of ewes for estrus synchronization. Avikesil-S+PGF2α+PMSG protocol was efficient estrus synchronization with better conception rate in Hassan breed of sheep than other treatment protocols studied.