Mahan, D. C., S. D. Carter, T. R. Cline, G. Hill, S. W. Kim, P. S. Miller, J. L. Nelssen, H. H. Stein, and T. L. Veum. 2007. Evaluating the effects of supplemental B vitamins in practical swine diets during the starter and grower-finisher periods. A regional study. J. Anim. Sci. 85:2190-2197. Link to full text (.pdf)