Authors : A.K. Zonturlu , F. Aral and U. Yavuzer
Abstract: The object of this study was to investigate, the effect of PGF2α administrated on 5 and 7 d following GnRH treatment on estrus and pregnancy during the breeding season in awassi ewes. A total of 60 ewes 3-5 years old were used in this experiment. The ewes were divided into 3 groups (20 ewes/group) in breeding season. First group (control) was treated with the PG-10 day protocol consisting of 2 intramuscular (i.m.) doses of PGF2α analogue (250 μg of D-Cloprostenol/dose). The second group received intramuscular injection of GnRH analogue (busereline) and 5 day later an i.m. injection of PGF2α. In the 3 groups were treated with GnRH followed, 7 days later, by an i.m. injection of 250 μg of prostaglandin F2α. After the detection of estrus, the ewes were inseminated with 0.2 mL fresh sperm. Pregnancy was determined using ultrasonography on day 30 after the AI. Estrus response was 90% in Group 1, 90% in Group 2 and 35% in Group 3 (p<0.001). The pregnancy rate was 77.8% in Group 1, 83.3% in Group 2 and 42.8% in Group 3 (p<0.05). Lambing rate was 77.8% in Group 1, 83.3% in Group 2 and 42.8% in Group 3 (p<0.05). These results suggest that effect of induction estrus and pregnancy and lambing rate after GnRH and 5 days later an i.m. injection of prostaglandin F2α were higher than GnRH and PGF2α treatment followed 7 days injection of PGF2α. But comparable to PGF2α treatment with 10 days intervals.
A.K. Zonturlu , F. Aral and U. Yavuzer , 2009. Effect of Different Method GnRH-PGF2 Treatment on Induced of Estrus and Pregnancy in Breeding Season in Awassi Ewes. Journal of Animal and Veterinary Advances, 8: 660-663.