P. Guerra-M., O. Chacón, K. Lara-S., and R. Quiel, “VITAMIN D3 EVALUATION ON ANIMAL PERFORMANCE, CARCASS TRAITS AND MEAT TENDERNESS OF BRAHMAN CATTLE AND ITS CROSSES. GUALACA, PANAMÁ. 2003.”, ciencia-agropecuaria, no. 18, pp. 1-34, Feb. 2005.