Ryan, A., Kegley, E., Hawley, J., Powell, J., Hornsby, J., Reynolds, J., & Laudert, S. (2015). Supplemental trace minerals (zinc, copper, and manganese) as sulfates, organic amino acid complexes, or hydroxy trace-mineral sources for shipping-stressed calves. Prof Anim Sci.

Ryan, A.W., E.B Kegley, J. Hawley, J.G Powell, J.A Hornsby, J.L Reynolds, und S.B Laudert. "Supplemental Trace Minerals (zinc, Copper, and Manganese) As Sulfates, Organic Amino Acid Complexes, or Hydroxy Trace-mineral Sources for Shipping-stressed Calves." Prof Anim Sci 2015.

Ryan, A.W., et al. "Supplemental Trace Minerals (zinc, Copper, and Manganese) As Sulfates, Organic Amino Acid Complexes, or Hydroxy Trace-mineral Sources for Shipping-stressed Calves." Prof Anim Sci 2015.