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 



Pago 



Dairy Practices at the Government Farm at Eeltsville 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 PRDMTING OFFICE 



1921 



