1. Division of Animal and Veterinary Sciences, West Virginia University, Morgantown, West Virginia 26506
2. Department of Animal Science, Michigan State University, East Lansing, Michigan 48824
3. Center for Animal Functional Genomics, Michigan State University, East Lansing, Michigan 48824
4. Department of Physiology, Michigan State University, East Lansing, Michigan 48824
5. United States Department of Agriculture, Agricultural Research Service, United States Meat Animal Research Center, Clay Center, Nebraska 68933
6. Laboratory of Mammalian Reproductive Biology and Genomics, Michigan State University, East Lansing, Michigan 48824