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Journal of Nutrition Vol. 34 No. 6 December 1947, pp. 661-676
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Mineral Metabolism Studies in Dairy Cattle

I. The Effect of Manganese and Other Trace Elements on the Metabolism of Calcium and Phosphorus During Early Lactation1

J. T. Reid, K. O. Pfau, R. L. Salsbury, C. B. Bender and G. M. Ward2

New Jersey Agricultural Experiment Station, Sussex, New Jersey

A study was made of the effects of calcium and manganese and other mineral element supplementation upon the metabolism of calcium and phosphorus during the first 5 months of lactation of 8 Holstein and 4 Guernsey cows.

Calcium equilibrium was maintained most frequently in the group of cows receiving Mico5 as the supplement to a basal ration of grain, corn silage and timothy-clover hay, and seemed to be attributable to the additional intakes of iodine, magnesium, copper, cobalt, zinc and iron supplied by this product.

Supplementation of the same basal ration with MnSO4 in addition to CaCO3 resulted in negative calcium balances in every case, whereas several positive balances occurred and higher percentages of calcium were used when the basal ration was supplemented with CaCO3 alone. The marked depression of calcium metabolism appeared to be effected by MnSO4 supplementation.

Phosphorus metabolism was not appreciably affected by the supplements used in this experiment.

1 Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, Department of Dairy Industry. This research was supported by an appropriation from the Limestone Products Corporation of America, Newton, New Jersey.

5 See footnote 3 on p. 664.

2 The authors are indebted to Dr. S. B. Randle and Mr. R. L. Willis of the State Chemical Laboratory for a portion of the analysis.

Manuscript received 24 July 1947.




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