UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 945 
Contribution from the Bureau of Animal Industry 
JOHN R. MOHLER, Chief 
Washington, D. C. PROFESSIONAL PAPER May 27, 1921 
THE INFLUENCE OF CALCIUM AND 
PHOSPHORUS IN THE FEED ON THE 
MILK YIELD OF DAIRY COWS 
. By 
EDWARD B. MEIGS, Physiologist, and T. E. WOODWARD, 
Dairy Husbandman, of the Dairy Division 
CONTENTS 
Page 
Dairy Practices at the Government Farm at Beltsville 1 
Standard Rations Insufficient for Optimum Milk Yield 3 
Nature of the Deficiency in Routine Rations Fed at Beltsville * 5 
Discussion of Results 9 
Summary 12 
Description of Experiments, Protocols, and Tables . 13 
Literature Cited 27 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1921 
