Estrous response and conception rate in postpartum Bos taurus-Bos indicus cows, treated with bovine somatotropin in an ovulation induction program with progestogens and eCG
Por:
Rosas, LEV, Aguayo, CF, Ordaz, RL, Ceron, JH
Publicada:
1 jul 2011
Categoría:
Veterinary (miscellaneous)
Resumen:
Bovine somatotropin (bST) injection was administered at the beginning of the ovulation induction with progesterone and eCG, and a second one during insemination to prove if it increased estrous response and conception rate (CR) in postpartum beef cows. A hundred and seventy four cows (Bos taurus-Bos indicus) of 60 to 100 days postpartum, with offspring and body condition of 2 to 2.5 were used. A progesterone-releasing intravaginal device (CIDR) was inserted to all females for 9 days and, while removing it, PGF2a was injected. Cows were randomly assigned to the following treatments: eCG (n = 44), received 400 IU of eCG at the moment CIDR was removed; bST (n = 44), received 500 mg of bST when CIDR was inserted and 500 mg of bST during insemination; bST-eCG (n = 44), received 500 mg of bST when CIDR was inserted and 400 IU of eCG while removing it; and 500 mg of bST during insemination; control (n = 42), only received the CIDR. Progesterone concentrations were assessed before the insertio
Filiaciones:
Rosas, LEV:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Reprod, Mexico City 04510, DF, Mexico
Aguayo, CF:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Reprod, Mexico City 04510, DF, Mexico
Ordaz, RL:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Genet & Bioestadist, Mexico City 04510, DF, Mexico
Ceron, JH:
Univ Nacl Autonoma Mexico, Fac Med Vet & Zootecnia, Dept Reprod, Mexico City 04510, DF, Mexico
|