1. Department of Anatomy, Physiology and Pharmacology, Cellular and Molecular Biosciences Program, Auburn University, Auburn, AL 36849-5517
2. Department of Animal Sciences, Endocrinology and Animal Biosciences Program, Rutgers, The State University of New Jersey, New Brunswick 08901
3. USDA ARS, US Meat Animal Research Center, Clay Center, NE 68933-0166