1. Dep. of Animal Science ESALQ–Univ. of São Paulo 11 Pádua Dias av. Piracicaba São Paulo 13418‐900 Brazil
2. Dep. of Agricultural and Biological Engineering Univ. of Florida Gainesville FL 32611 USA
3. Embrapa Pecuária Sudeste km 234 Washington Luiz Highway, ‘Fazenda Canchim’, PO Box 339 São Carlos São Paulo 13560‐970 Brazil
4. Dep. of Animal Science UFLA–Federal Univ. of Lavras PO Box 3037 Lavras Minas Gerais 37200‐900 Brazil
5. Embrapa Pesca e Agricultura PO Box 90 Palmas Tocantins 77008‐900 Brazil
6. Institute for Sustainable Food Systems Univ. of Florida Gainesville FL 32611 USA