Solarte Portilla, Carlos E., and Gema L. Zambrano Burbano. “Characterization and Genetic Evaluation of Holstein Cattle in Nariño, Colombia”. Revista Colombiana de Ciencias Pecuarias 25, no. 4 (December 10, 2012): 539–547. Accessed February 8, 2025. https://revistas.udea.edu.co/index.php/rccp/article/view/324796.