1. Department of Animal Science (N.L., K.M.S., D.T.C., W.E.P., V.M.B., R.M.M., A.S.C.), Winona, Minnesota 55987
2. University of Nebraska-Lincoln, Lincoln, Nebraska 68583–0908; Winona State University (J.S.W.), Winona, Minnesota 55987
3. University of California-San Diego School of Medicine (N.F.), La Jolla, California 92093
4. Department of Veterinary Biomedicine (D.W.S.), Faculty of Veterinary Medicine, University of Montreal St-Hyacinthe, Québec, Canada J2S 2M2