1. Federal University of Rio Grande do Sul, Faculty of Agronomy, Animal Science Department, Porto Alegre, Brazil
2. Alexandria University, Faculty of Agriculture, Animal Production Department, Alexandria, Egypt
3. GRASP Ind. & Com. LTDA, Division of Research and Development, Curitiba, Brazil
4. University of São Paulo, Centre for Nuclear Energy in Agriculture, Laboratory of Animal Nutrition, Piracicaba, Brazil
5. Livestock Department, Arid Land Cultivation Research Institute, Alexandria, Egypt
6. University of São Paulo, College of Agriculture “Luiz de Queiroz”, Department of Animal Science, Piracicaba, Brazil
7. University of São Paulo, Centre for Nuclear Energy in Agriculture, Cellular and Molecular Biology Laboratory, Piracicaba, Brazil