1. Department of Genetics and Biostatistics, National Autonomous University of Mexico, Ciudad Universitaria, P.O. Box 04510, Mexico City, Mexico.
2. Department of Animal Science, Michigan State University, Michigan, P.O. Box 48824, East Lansing, MI, USA.
3. Department of Plant, Soil and Microbial Sciences, Michigan State University, Michigan, P.O. Box 48824, East Lansing, MI, USA.
4. Department of Animal Sciences, University of Florida, Florida, P.O. Box 32608, Gainesville, FL, USA.
5. Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Wisconsin, P.O. Box 53706, Madison, WI, USA.
6. Department of Epidemiology and Biostatistics, Michigan State University, Michigan, P.O. Box 48824, East Lansing, MI, USA.
7. Department of Statistics and Probability, Michigan State University, Michigan, P.O. Box 48824, East Lansing, MI, USA.
8. Institute for Quantitative Health Science and Engineering, Michigan State University, Michigan, P.O. Box 48824, East Lansing, MI, USA.