1 Department of Animal Science, University of California, Davis, CA 95616; Department of Population Health and Reproduction, University of California, Davis, CA 95616 jdmurray@ucdavis.edu eamaga@ucdavis.edu.
2 Department of Animal Science, University of California, Davis, CA 95616; jdmurray@ucdavis.edu eamaga@ucdavis.edu.