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Journal of Dairy Science Vol. 54 No. 3 429-432
© 1971 by American Dairy Science Association ®
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Influence of High Dietary Calcium and Phosphorus and Ca:P Ratio on Liver Copper and Iron Stores in Lactating Cows

J. T. Huber1 and N. O. Price

Department of Dairy Science and Department of Biochemistry and Nutrition, Virginia Polytechnic Institute, Blacksburg 24061

ABSTRACT

The copper and iron status of lactating cows fed rations borderline in copper (6 mg/kg) but of high calcium content or with wide Ca:P ration was investigated. Liver copper stores decreased on the basal ration (which contained 0.88% Ca and 0.47% P) and also when dietary Ca was elevated to 2.3% (resulting in a 5:1 Ca:P ratio). However, an increase in phosphorus to 1.2% along with 2.3% Ca to maintain a 2:1 ratio significantly alleviated the depression in liver Cu. Iron stores were not affected by treatment.

FOOTNOTES

1 Present address: Dairy Department, Michigan State University, East Lansing 48823.






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Copyright © 1971 by the American Dairy Science Association ®.