Effects of eCG (Dosage and injection time) on reproductive performance in Kurdish ewes

Introduction: A completely randomized design experiment was conducted on one hundred and five Kurdish ewes during the breeding season to investigate the efficiency of eCG (dosage and injection time) on reproductive performance. Materials and methods: Ewes (2-6 years old, weighing 57.5-58 kg and BCS 2.5-3.5) were randomly divided into seven different treatments. In all treatments the ewes were treated with CIDR for 14 days and after CIDRs withdrawal 450 IU eCG were injected intramuscularly to ewes of treatment 2, 3 and 4 at zero, 12 and 24 h after CIDR withdrawal, respectively, and 550 IU eCG were injected intramuscularly to ewes of treatment 5, 6 and 7 at zero, 12 and 24 h after CIDRS withdrawal, respectively, the first group was used as control. All of treatments, except control, were received 10 mg FSH intramuscularly at 24 h after CIDR removal. Results: Lambing rates in all seven treatments, was, 40, 80, 80, 73.3, 86.6, 86.6 and 93.3% respectively, and was significantly higher than control group (p<0.05). However, the differences among any of the groups in terms of the gestation period and lambs birth weight rate were statistically insignificant (p>0.05). Multiple birth rate for all treatments were higher than control group significantly (p<0.05). Conclusion: In conclusion, the results showed that; treatment of ewes with eCG at the time of estrus and prior mating, improved the conception and twinning birth rates ewes

کلیدواژه ها:

eCG ، Kurdish ewes ، Lambing rate ، Reproduction