1. Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias—Campo Experimental Bajío, Carretera Celaya San Miguel de Allende, Kilómetro 6.5, Celaya 38010, Guanajuato, Mexico
2. Department of Biotechnology and Bioengineering, CINVESTAV-IPN, P.O. Box 14-740, Mexico City 07000, Mexico
3. Departamento de Zootecnia, Universidad Autónoma Chapingo, Km. 38.5, Carr. México-Texcoco, Chapingo, Texcoco 56230, Mexico State, Mexico