[1] Texas Tech Univ, Lubbock, TX 79409 USA
[2] Texas A&M Univ, College Stn, TX USA
[3] Prarieview A&M Univ, Prairie View, TX USA
[4] Texas A&M Univ, Dept Anim Sci, College Stn, TX 77843 USA
[5] Univ Georgia, Dept Anim & Dairy Sci, Athens, GA 30602 USA