Oestrus synchronization in ewes with Fluorogestone acetate out of breeding season
Subject Areas : Journal of Large Animal Clinical Science Research(JLACSR)
Keywords: estrus synchronization, Ewe, fluorogestone acetate,
Abstract :
This experiment were conducted to evaluate the efficacy of intravaginal sponge pessary (fluorogestone acetate;40mg ) to induce a synchronized estrus in lactating ewes and reproductive performance (fertility and fecundity) in out of breeding season in suburb of urmia. For this purpose 182 lactating ewes at around of 3-4 months of post partum were selected. Females were randomly divided into two groups considering their age and post partum period. Group1 (n =101) received an intravaginal sponge (40 mg fluorogeston acetate ; Chrono-gest ، intervet ، Holland) for 14 days and with an injection of 500 i.u PMSG ( Folligon ، intervet ، Holland ) at the removal of sponges. Females in group 2 (n = 81) did not received further treatment and were considered as control. At the time of removal progesterone ، the appearance of vaginal discharge was investigated. Twelve hours after termination of treatment ، fertile ram was used to detected estrus and mating. Estrus response also fertility and lambing rates on the base of labor information in all females were analyzed with using of chi-square test. In group one 14 ewes had abnormal vaginal discharge at the time of removal. Estrus response، fertility and lambing rate for treatment group were 76، 45.5 and 64.6 percent; respectively (p<0.05). Estrus was detected only 9.8 percent of females in control group (p<0.01). The prolificacy rate for treatment group was 1.4 (p>0.05).These results revealed that using of fluorogestone acetate ( 40 mg ) for 14 days with together of PMSG (500 i.u) can be used with acceptable fertility rate in out of breeding season in lactating ewes around of urmia.
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