1. Department of Animal Science, University of California Davis, Davis, California, USA.
2. Department of Animal Reproduction, College of Veterinary Medicine and Animal Science, University of Sao Paulo, Sao Paulo, Brazil.
3. Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin, USA.
4. Department of Animal Science, Michigan State University, East Lansing, Michigan, USA.
5. Department of Animal Sciences, University of Wisconsin, Madison, Wisconsin, USA.
6. Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, Michigan, USA.