1. School of Animal Sciences, Virginia Polytechnic Institute and State University , Blacksburg, VA 24061 , USA
2. Department of Genetics, “Luiz de Queiroz” College of Agriculture, University of S ao Paulo , São Paulo 13418 , Brazil
3. Department of Agronomy and Horticulture, University of Nebraska-Lincoln , Lincoln, NE 68583 , USA
4. Faculty of Biology, VNU University of Science, Vietnam National University , 334 Nguyen Trai, Thanh Xuan, Hanoi , Vietnam
5. Department of Biochemistry, University of Nebraska-Lincoln , Lincoln, NE 68588 , USA
6. Center for Advanced Innovation in Agriculture, Virginia Polytechnic Institute and State University , Blacksburg, VA 24061 , USA