CALCIUM AND PHOSPHORUS IN THE FEED OF DAIRY COWS. 25 



phosphate" gives the milk yields to be expected after the experi- 

 mental feeding, using the yields after the control feeding as a basis 

 and taking into account the facts that some of the animals aborted, 

 and that the last four were heifers with their first calves in the con- 

 trol period and with their second or later calves in the experimental 

 period. The figures represent the milk yield in 30 days beginning 

 soon after calving. 



Table 8. — Expected and actual 30-day milk yields of cows from the general herd 

 after alternated phosphate feeding: actual yields after control feeding. 



No. of animal. 



Actual 



milk yield 



after 



control 



rations. 



Expected 

 milk yield 

 after al- 

 ternated 

 rations with 

 phosphate. 



Actual 

 milk yield 

 after al- 

 ternated 

 rations with 

 phosphate. 



17 



Pounds. 

 847 

 831 

 995 

 669 

 422 

 632 

 685 



Pounds. 

 847 

 565 

 995 

 599 

 495 

 739 

 753 



Pounds. 



858 



4y 



953 



50 



972 



54 



1,027 

 1,018 



63 



71 



1 121 



81 



936 







Total 



5,081 



4,993 



6 885 







The actual yields after the alternated feeding with phosphate aver- 

 age 37.9 per cent more than the expected. 



GRAIN MIXTURES USED IN EXPERIMENTS. 9 



GRAIN MIXTURE A. 



Corn meal 45 pounds. 



Wheat bran 36 pounds. 



Cottonseed meal 18 pounds. 



NaCl 1 pound. 



GRAIN MIXTURE C. 



Corn-and-cob meal 45 pounds. 



Wheat bran 36 pounds. 



Cottonseed meal 18 pounds. 



NaCl 1 pound. 



GRAIN MIXTURE CPi. 



Grain C 100 pounds. 



Na 2 HP0 4 . 12H 2 10 pounds. 



GRAIN MIXTURE D. 



Hominy grits 45 pounds. 



Ground oats 36 pounds. 



Cottonseed meal 18 pounds. 



NaCl 1 pound. 



9 The cottonseed and linseed meal used in these mixtures were meals from which the 

 fat had been extracted by the old process: — heat and pressure without solvents. 



GRAIN MIXTURE B. 



Corn meal 40 pounds. 



Wheat bran 40 pounds. 



Cottonseed meal 20 pounds. 



NaCl 1 pound. 



GRAIN MIXTURE CP. 



Grain C 100 pounds. 



NasHPO*. 12H 2 Q 11 pounds. 



GRAIN MIXTURE CP 2 . 



Grain C 100 pounds. 



Na 2 HP04. 12H 2 6 pounds. 



GRAIN MIXTURE DP. 



Grain D 100 pounds. 



Na.HPCh. 12H 2 19 pounds. 



