Sanders, D E Evaluating copper and zinc in dairy rations. [electronic resource] - Journal of the American Veterinary Medical Association Nov 1991 - 1119-20 p. digital Publication Type: Letter ISSN: 0003-1488 Subjects--Topical Terms: Animal Feed--adverse effectsAnimalsCattleCattle Diseases--chemically inducedCopper--deficiencyFemaleZinc--adverse effects