Location: Range and Livestock Research2011 Annual Report
1a. Objectives (from AD-416)
To improve our understanding of the mechanism(s) by which pre-ovulatory estradiol concentration and a prolonged pro-estrus affect embryo development and pregnancy establishment in beef cattle.
1b. Approach (from AD-416)
Mechanisms controlling fertility of single matings in beef cattle are poorly understood, especially cows that exhibit estrus. The scientists involved with this agreement from both institutions will share data and research efforts to identify mechanisms controlling fertility and their effects on early embryo development, pregnancy establishment and maintenance. This research will include evaluation of serum estradiol and luteinizing hormone collected from cows around the time of ovulation and the role of these hormones on oocyte maturation, fertilization, early embryo development, and the ability of differentially developed oocytes to establish viable pregnancies. The USDA-ARS, Fort Keogh, Miles City, MT, has a majority of the cattle used for these studies, and the research involved with these studies will occur at Fort Keogh.
3. Progress Report
This project is part of the research program conducted under National Program 101/Food Animal Production, Component entitled "Understanding, Improving, and Effectively Using Animal Genetic and Genomic Resources, and has the goal of Improving Reproductive Efficiency in Livestock". A Ohio State University scientist visited hte ARS lab for one week to work toward statistical analyses and preparation of manuscripts for publication. Six presentations at regional, national, and international meetings included data from this collaborative effort. ADODR monitoring is through phone calls, e-mails, and discussions at professional meetings.