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Calcium and Phosphorus Metabolism in Dairy Cows

III. The Adequate Ration for High-Producing Cows and the Effect of Exercise on Calcium, Phosphorus and Nitrogen Balances^*

(From the Research Laboratories, Bureau of Dairy Industry, U. S. Dept. of Agriculture, Beltsville, Md.)

Two cows, receiving an excellent dry ration consisting of well-cured alfalfa hay, mangel beets, and a good grain mixture (Ca/P ratio 1.09–1.19), and yielding 27 and 22 kgs. of milk daily, remained in prevailingly negative calcium and phosphorus balances throughout a period of seven weeks. This occurred in the early part of the lactation period.

During the last three weeks of the experiment the introduction daily of one-half hour's exercise produced slight and probably insignificant effects on the calcium and phosphorus metabolism but a very marked effect on the nitrogen metabolism. Without allowing for exercise, the animals received 5 per cent more than their energy requirements calculated on the basis of the Savage standard.

Manuscript received 18 January 1929.

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