1. Department of Animal Sciences, D.H. Barron Reproductive and Perinatal Biology Research Program, and Genetics Institute, University of Florida, Gainesville, FL, USA
2. Division of Animal Science, University of Missouri, Columbia, MO, USA
3. Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA, USA
4. Department of Animal Sciences, University of Puerto Rico, Mayagüez, PR, USA