Comparative efficacy of Hormonal methods in oestrus synchronization and multiovulation in sheep

Abstract

Studies were conducted at three different hormonal methods. 80 mg progesterone impregnated sponge for 14 days plus 1000 IU PMSG injection on sponge removal. 375 mg Progesterone implant subcutaneously for 14 
days plus 1000 IU PMSG on day 12 of oestrus  cycle and 15 mg PGF2 alpha on day 14. Synchronization observed was 100, 85.71 and 100 percent respectively. In control group, it 
was 71.4 1 percent during entire period of cycle. The average time required for onset of oestrus 
after last hormonal injection w&s (46.28±9.5 hours) significantly longer than sponge and implant group. Duration of hormonaly 
synchronized oestrus in ewes of sponge group was (45.28±4.17 hours) significantly longer than 
implant group (33.00±2.58 hr) control group (28.2± 1.82 hours) and Prostaglandin group ( 40.00±3.45 hours). The average number of Carpora lutea was highly significant (P < 0.01) '.:>etween the sponge group and control group, implant group and control group, Prostaglandin group and control group. The difference was 
also highly significant (P < 0.01) between 
Prostaglandin group and sponge group. The average number of Carpora lutea were nonsignificant between sponge group and 
implant group.