Productive performance of Brangus cattle at weaning in grazing conditions in Colombia od Motta-Delgado, Pablo Andrés, Benítez-Vásquez, Carolina, López-Perea, Maira Alejandra, Plaza-Cárdenas, Johanna Alessandra, Dussan-González, Camilo, Peñaloza-Galeano, Milton Emiliano