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Effects of feeding high amounts of zinc sulfate to lactating dairy cows for an extended period



Effects of feeding high amounts of zinc sulfate to lactating dairy cows for an extended period



Journal of Dairy Science 71(Suppl. 1): 153



Using a control diet of silage and concentrates, 30 Holstein cows were fed 0, 1000 or 2000 p.p.m. of supplemental zinc in a whole-lactation study. With 1000 p.p.m. Zn no adverse affects were noted on milk yield, performance, health or reproduction. After several weeks, 2000 p.p.m. Zn reduced milk yield. There was considerable variation among cows. Generally, first calf heifers were more tolerant. When milk yield of cows given 2000 p.p.m.

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Accession: 001580803

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