1. Department of Animal Science, Federal University of Maranhão, Chapadinha 65500-000, Maranhão, Brazil
2. Department of Animal Science, Federal University of Piauí, Teresina 64049-550, Piauí, Brazil
3. Department of Animal Science, Federal University of Paraíba, Areia 58051-900, Paraíba, Brazil
4. Department of Animal Science, University of Wisconsin, Madison, WI 53706, USA