A Novel Estrous Synchronization Program for Beef Cattle Using Melengestrol Acetate

Authors

Karol Fike, University of Nebraska-LincolnFollow
Michael Wehrman, University of Nebraska-Lincoln
Brad Lindsey, University of Nebraska-Lincoln
Ellen G. M. Bergfeld, University of Nebraska-LincolnFollow
Eric Melvin, University of Nebraska-Lincoln
Jorge Quintal, University of Nebraska-Lincoln
Eraldo Zanella, University of Nebraska-Lincoln
Freddie Kojima, University of Nebraska-Lincoln
James Kinder, University of Nebraska-LincolnFollow

Date of this Version

1-1-1998

Comments

Published in Nebraska Beef Cattle Report 1998, published by Agricultural Research Division, University of Nebraska Cooperative Extension, and Institute of Agriculture and Natural Resources, University of Nebraska–Lincoln.

Abstract

Estrous synchronization rate and conception and pregnancy rates to AI were evaluated following three estrous synchronization protocols for beef cattle. During 1995 and 1996, heifers and cows (n = 379) received either: 1) melengestrol acetate (MGA) for 18 days plus an injection of progesterone and estradiol in oil 7 days before end of treatment; 2) MGA for 17 days; or 3) two injections of PGF_2&#;&#;&#;10 days apart. The greatest pregnancy rates (number conceived/number treated) among both anestrous and estrual females were achieved following treatment with MGA and an injection of progesterone and estradiol.