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Calcium and Phosphorus as the Limiting Factors for Milk Secretion

Dairy Division, U. S. Agricultural Department of Agriculture

Abstract

For the last nine years a herd of about a hundred cows has been maintained on the U. S. Experimental Farm at Beltsville, Maryland. These cows have, for the most part, had little or no pasture. The feeds used have been corn meal, wheat bran, cottonseed and linseed meal, legume hay, corn silage and corn stover. They were given to most of the cows in such quantities and proportions as to supply somewhat more protein and total nutrients than were required for the growth, maintenance, milk yield and reproduction of the animals according to the most liberal of the American feeding standards.

The cows were of good ancestry. There were about 30 grades, mostly of good stock; the others were registered Holsteins, Guernseys and Jerseys. In spite of the good ancestry of the cows, their average annual milk yield was only about 5,000 pounds.