Defining growth curves with nonlinear models in seven sheep breeds in Mexico. - Domínguez-Viveros, Joel; Canul-Santos, Edwin; Rodríguez-Almeida, Felipe Alonso; Burrola-Barraza, María Eduviges; Ortega-Gutiérrez, Juan Ángel; Castillo-Rangel, Francisco (Revista Mexicana de Ciencias Pecuarias, 2019)