Báez-Sandoval, G.M. and Gutiérrez-Lizarazo, D.E. 2020. Effect of altitude and size of livestock farms on productive and reproductive aspects in the south-western region of Norte de Santander. Respuestas. 25, 3 (Sep. 2020), 41–53. DOI:https://doi.org/10.22463/0122820X.1782.