lsea, W., y T. A. Olson. 2010. «Breed Effects of cow’s Sire and Service Sire on Reproduction of Crossbred Dams and Preweaning Performance of Their Calves». Revista Científica De La Facultad De Ciencias Veterinarias 8 (1). https://produccioncientifica.luz.edu.ve/index.php/cientifica/article/view/14308.