Berroa, D., L. Wong-H., E. Agudo, and F. Vega. “EFFECT OF BOVINE SOMATOTROPHIN HORMONE ON MILK PRODUCTION IN DAIRY COWS GRASSING DURING RAINY SEASON. BUGABA, CHIRIQUI, PANAMA. 1997.”. Ciencia Agropecuaria, no. 15, Feb. 2004, pp. 125-33, http://revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/215.