Use of different doses of rBST associated to a protocol for multiple ovulation and embryo transfer in buffalo (Bubalus bubalis)

Abstract

The efficiency of different doses of rBST in a MOET protocol was verified in buffaloes. The animals received an intravaginal progesterone device (DIB®) plus 2.0 mg of estradiol benzoate (Ric-BE®, i.m.) and 0 mg, 250 mg or 500 mg of rBST. Ovarian follicular growth was stimulated by treatment with 200 mg of FSH in decreasing amount (12/12hs). Buffaloes received injections of PGF2α on D6 and on D7. The DIB® was removed on D7. On D8, 24 hours after DIB® removal, ovulation was induced with GnRH. The follicular emergence and the response to FSH treatment were evaluated by ultrasound on D4 and D8. The artificial insemination (AI) was performed 12 and 24 hours after the GnRH administration. The embryonic structures were collected 5.5 days after the first AI. Data were analyzed by ANOVA. No statistical differences were found between groups. The results indicated that rBST, associated to a MOET protocol at the different dosages used, does not to improve the efficiency of the technique in buffalo.