1. Department of Animal Sciences Center for Reproductive Biology Washington State University PO Box 646310Pullman WA 99164‐6310 USA
2. Division of Animal Sciences S158A Animal Sciences Research Center University of Missouri Columbia MO 65211 USA
3. Department of Animal and Veterinary Sciences Caldwell Research and Extension Center University of Idaho 1904 E Chicago St, Suite A, B Caldwell ID 83605 USA