F.C. Gwazdauskas, A.H. Walters, M.L. McGilliard, S.F. Ball, N. Ellefson, S.S. Flesher, L.L. Keyes, W.F. Nicholson, K.S. Rosoff, K.A. Strahsmeier, M.R. Wheeler, I.A. Polejaeva and D.L. Ayares
Journal of Animal and Veterinary Advances 2 ( 8 ): 430 - 436 , 2003