IDENTIFY MECHANISMS BY WHICH OVULATORY FOLLICLE SIZE AFFECTS PREGNANCY ESTABLISHMENT AND MAINTENANCE IN BEEF COWS
Livestock and Range Research Laboratory (LARRL)
2012 Annual Report
1a.Objectives (from AD-416):
To improve our understanding of the mechanism(s) by which ovulatory follicle size affects pregnancy establishment and embryonic mortality.
1b.Approach (from AD-416):
ARS – A student from Conapec will visit the Fort Keogh Livestock and Range Research Laboratory (LARRL) and evaluate the effects of serum estradiol and ovulatory follicle size on embryo quality & morphology, and pregnancy establishment & maintenance in beef cows.
Conapec – members will evaluate effects of exogenous estradiol cypionate, equine chorionic gonadotropin, and temporary calf removal on ovulatory follicle size, and establishment / maintenance of pregnancy in large beef herds in Brazil. Information will be mutually shared between involved parties.
Progress on this project included preparation of 2 manuscripts that almost ready for submission. In addition, we are working to include another student from Brazil in the final two years of this project.