Impact of progesterone and estradiol treatment before the onset of the breeding period on reproductive performance of Bos indicus beef heifers

•P4 stimulus prior to breeding period improves heifer reproductive efficiency.•E2 ester at P4 stimulus removal improved heifer response.•Heifers treated with P4+E2 have increased pregnancy early in the breeding period. The present aimed to develop a hormonal therapy based on the insertion of a proge...

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Bibliographic Details
Published in:Animal reproduction science 2015-09, Vol.160, p.30-39
Main Authors: Sá Filho, M.F., Nasser, L.F.T., Penteado, L., Prestes, R., Marques, M.O., Freitas, B.G., Monteiro, B.M., Ferreira, R.M., Gimenes, L.U., Baruselli, P.S.
Format: Article
Language:English
Subjects:
Anestrous
Animals
Bovine
Cattle
Drug Administration Schedule
Drug Therapy, Combination
Estradiol - administration & dosage
Estradiol - analogs & derivatives
Estradiol - pharmacology
Female
Pregnancy
Progesterone - administration & dosage
Progesterone - pharmacology
Puberty
Reproduction
Reproductive efficiency
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Summary:•P4 stimulus prior to breeding period improves heifer reproductive efficiency.•E2 ester at P4 stimulus removal improved heifer response.•Heifers treated with P4+E2 have increased pregnancy early in the breeding period. The present aimed to develop a hormonal therapy based on the insertion of a progesterone (P4) insert (PI) during 10 d plus an estradiol injection (E2) at PI removal before the onset of breeding of beef heifers. In Exp. 1, the plasma P4 profile of prepubertal heifers showed that the insertion of a PI or 24 d previously used P4 insert (UPI) sustained plasma P4 above 1ng/mL for at least the first 7 d of the treatment. In Exp. 2 there was no positive effect of additional estradiol benzoate (EB) administered at the insertion of UPI on the proportion of heifers with a corpus luteum (CL/Treated) 30 d after UPI removal [UPI+EB=85.3%a (n=134); EB+UPI+EB=80.8%a (n=125)]; however, both were greater (P
ISSN:0378-4320
1873-2232
DOI:10.1016/j.anireprosci.2015.06.024