Effects of supplemental zinc, copper, and manganese concentration and source on performance and carcass characteristics of feedlot steers 1 1Use of trade names in this publication does not imply endorsement by Colorado State University or criticism of similar products not mentioned. Mention of a proprietary product does not constitute a guarantee or warranty of the products by Colorado State University or the authors and does not imply its approval to the exclusion of other products that may also be suitable.

Abstract
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