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Brazilian Journal of Veterinary Research and Animal Science

versão On-line ISSN 1678-4456


MIZUTA, Katia  e  MADUREIRA, Ed Hoffmann. Estrus synchronization in Nelore females (Bos taurus indicus) using melengestrol acetate with or without prostaglandin F2a. Braz. J. Vet. Res. Anim. Sci. [online]. 1999, vol.36, n.5, pp. 00-00. ISSN 1678-4456.

This study was conducted to determine the efficacy of melengestrol acetate (MGA) with or without prostaglandin F2a (PG) in synchronizing estrus in Zebu females (Nelore - Bos taurus indicus). Five hundred and forty-eight cows and heifers were allotted to one of three groups by age, body condition score, sex of calf and days postpartum. Group 1 served as a nonsynchronized control (n = 119) and cows were fed a protein mineral salt carrier without MGA, animals in group 2 (n = 219) were fed 0.5 mg MGA/head/day, for 14 days, and group 3 (n = 210) animals were fed 0.5 mg MGA/head/day for 14 days and were injected i.m. with 25 mg PG, 17 days after the last day of MGA feeding. Cows and heifers were artificially inseminated 12 h after the detection of estrus. The MGA/PG and MGA systems induced synchronized estrus and enabled more cows to become pregnant early in the breeding season compared with nonsynchronized control cows that were inseminated during spontaneous estrus (group 1 = 17.65% vs group 2 = 27.40%; group 3 = 31.90%). In this respect, PG injection caused a larger number of 5 day estrus responses in the MGA/PG group, greatly facilitating the use of AI.

Palavras-chave : Estrus; Synchronization; Nelore; Melengestrol; Prostaglandin.

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