Estrus synchronization in Nelore females (Bos taurus indicus) using melengestrol acetate with or without prostaglandin F2alpha

Authors

  • Katia Mizuta Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Ed Hoffmann Madureira Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP

DOI:

https://doi.org/10.1590/S1413-95961999000500010

Keywords:

Estrus, Synchronization, Nclore, Melengestrol, Prostaglandin

Abstract

This study was conducted to determine the efficacy of melengestrol acetate (MGA) with or without prostaglandin F2alpha (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.

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Published

1999-01-01

How to Cite

Mizuta, K., & Madureira, E. H. (1999). Estrus synchronization in Nelore females (Bos taurus indicus) using melengestrol acetate with or without prostaglandin F2alpha. Brazilian Journal of Veterinary Research and Animal Science, 36(5), 273-280. https://doi.org/10.1590/S1413-95961999000500010

Issue

Section

VETERINARY MEDICINE

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