1. Texas A&M AgriLife Research, 1102 E Drew. St., Lubbock, TX 79403, USA
2. Texas A&M AgriLife Extension Service, 1102 E Drew. St., Lubbock, TX 79403, USA
3. Texas A&M AgriLife Research, 11708 US-70 South, Vernon, TX 76384, USA
4. School of Veterinary Medicine, Texas Tech University, 7671 Evans Drive, Amarillo, TX 79106, USA