1. Agricultural Research Service, Beltsville Agricultural Research Center (BARC) 1 US Department of Agriculture , , Beltsville, MD 20705 , USA
2. Purdue University 2 Department of Animal Science , , West Lafayette, IN 47907 , USA
3. Berry College 3 Department of Animal Science , , Mount Berry, GA 30149 , USA
4. Bindley Bioscience Center, Purdue University 4 Metabolite Profiling Facility , , West Lafayette, IN 47907 , USA