1. USDA‐ARS and Dep. Crop Science and Dep. Animal Science North Carolina State Univ. Raleigh NC 27695
2. USDA‐ARS Watkinsville GA 30677
3. Dep. Animal Science Texas Tech. Univ. Lubbock TX 79409
4. Cooperative investigation of the USDA‐ARS and the North Carolina ARS Raleigh NC 27695‐7642