[1] USDA ARS, Beltsville Agr Res Ctr, Beltsville, MD USA
[2] Univ Missouri, Columbia, MO USA
[3] USDA ARS, US Meat Anim Res Ctr, Clay Ctr, NE USA
[4] George Mason Univ, Fairfax, VA 22030 USA
[5] Illumina Inc, San Diego, CA USA
[6] Univ Alberta, Edmonton, AB T6G 2M7, Canada