J. Anim Sci.
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Published online first on March 13, 2009
J. Anim Sci. 1910. doi:10.2527/jas.2008-1757
© 2009 American Society of Animal Science
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Development of estrus synchronization protocols using melengestrol acetate in Bos indicus cattle

O. G. Sá Filho*, D. J. Patterson{dagger} and J. L. M. Vasconcelos*

* Departamento de Produção Animal, Faculdade de Medicina Veterinária e Zootecnia-UNESP, Botucatu-SP 18618-000, Brazil {dagger} Division of Animal Sciences, University of Missouri, Columbia 65211

vasconcelos{at}fca.unesp.br

Abstract

Five experiments were conducted on commercial farms in Brazil designed to develop the basis for an estrus synchronization protocol using melengestrol acetate (MGA) in Bos indicus cattle. These studies resulted in the development of the following protocol: 0.5 mg·d-1 of melengestrol acetate between d -14 and -1; 2.0 mg i.m. injection of estradiol cypionate on d -9; 48 h temporary weaning between d 0 and 2; and natural service beginning on d 0. The basis of this protocol was to induce estrous cyclicity before postpartum loss of body condition, prevent premature luteolysis, eliminate the need for labor required to detect estrus, and consequently increase the likelihood of pregnancy early during the postpartum period. This treatment effectively induced estrous cyclicity among anestrous cows, synchronized estrus activity, and prevented premature luteolysis with no negative effect on pregnancy.

Key Words: Key-words: anestrous • Bos indicus • estrus synchronization • melengestrol acetate






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