Nelmy Narvaez1, Arieh Brosh2, Miguel Mellado3, and Wolfgang Pittroff1. (1) Animal Science, University of California, Davis, 2324 Shasta Drive Apt # 9, Davis, CA 95616, (2) Department of Cattle and Genetics, Agricultural Research Organization - Institute of Animal Science, Ramat Yishal, Israel, (3) Department of Nutrition and Foods, Universidad Autonoma Agraria Antonio Narro, Saltillo, 25315, Mexico