Özet:

Effect of injections of β-carotene or Vitamin E+Selenium (Vit E + Se) before the estrus on fertility in synchronized ewes during anestrus season were elucidated in the present study. Ewes (n=58) were synchronized for d 10 by intravaginal impregnant-progesterone sponge. One day before sponge withdrawal, 400 IU Pregnant Mare Serum Gonadotropin (PMSG) and 125  g prostaglandinF2alfa (PGF  ) were intramuscularly injected. After that, synchronized ewes were divided into three groups, randomly. β-carotene (1 mg/kg β-carotene, the first group, n=22) or Vit E+Se injections (200 mg DLalfa tocopherol acetate+0,67 mg selenium, the second group, n=22) were applied on sponge withdrawal day. The third group ewes (n=14) was considered as control. Pregnancy examinations were performed 35 d after mating via transrectal ultrasonography. Pregnancy rate and lambing performance were obtained 59.1%, 45.5% in the first group, 50.0%, 68.2% in the second group, and 64.3%, 57.1% in the third group, respectively. In conclusion, it is concluded that the injections of βcarotene or Vit E + Se before estrus didn’t have a positive effect on fertility in synchronized ewes in anestrus season.

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