© 2012 Zambrano-Burbano et al., licensee InTech. This is an open access chapter distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Relationship Between Kappa Casein Genes (CSN3) and Industrial Yield in Holstein Cows in Narino-Colombia