CALCIUM AND PHOSPHORUS IN THE FEED OE DAIRY COWS. 23 



reduced to negligible proportions in the case of cows whicli have been 

 superabundantly fed in their immediately preceding lactation period. 



EFFECTS OF PHOSPHATE FEEDING ON BODY WEIGHT. 



Both the animals on the experimental feeding and those used as 

 controls were weighed from time to time. The results are given in 

 Tables 4, 5, 6, and 7. These figures summarize all the pertinent 

 results that we have. Heifers 67 and 214 were fed on the control 

 rations in the late winter of 1917-18 and changed over to the ex- 

 perimental rations a few weeks before they calved. They, therefore, 

 figure as controls in Table 4 and as experiment animals in Table 2. 

 They were on the experimental feeding for such short periods that 

 the weights obtained from them during those periods can not be 

 used in the present discussion. 



Table 4. — Heifers on control rations ; all four pregnant. 





Period 

 during 

 which 

 weigh- 

 ings were 

 taken. 



Average 

 daily 

 gain. 



Daily ration. 



No. of 

 animal. 



Feed. 



Quantity. 



Feed. 



Quantity. 



Feed. 



Quantity. 



67 



71 



SI 



214 



Days. 

 20 

 60 

 180 

 59 



Pounds. 

 1.75 

 0.65 

 1.04 

 0.90 



Grain C 



do 



Grain E... . 

 Grain C 



Pounds. 

 3 

 3 

 3 

 3 



Alfalfa hay. . 



do 



do 



do 



Pounds. 

 4 

 4 

 3 

 4 



Corn silage. . 



do 



do 



do 



Pounds. 

 30 

 30 

 30 



25 



Table 5. 



-Heifers fed alternate rations ivith phosphate ; No. 70 pregnant, No. 74 

 farrow. 





Period 

 during 

 which 

 weigh- 

 ings were 

 taken. 



Average 

 daily 

 gain. 



Average daily ration. 



No. of 

 animal. 



Feed. 



Quantity. 



Feed. 



Quantity. 



Feed. 



Quantity. 



70 



74 



Days. 

 70 

 80 



Pounds. 

 1.24 

 2.20 



Grain CPi . . 

 do 



Pounds. 

 3 

 3 



Alfalfa hay. . 

 do 



Pounds. 

 4 

 4 



Corn silage. . 

 do 



Pounds. 

 30 

 30 



Table 6. — Cows fed control rations during dry periods before calving. 





Period 

 during 

 which 

 weigh- 

 ings were 

 taken. 



Average 

 daily 

 gain. 



Daily ration. 



No. of 

 animal. 



Feed. 



Quantity. 



Feed. 



Quantity. 



Feed. 



Quantity. 



17 



50 



51 



64 



Days. 

 50 

 59 

 47 

 60 



Pounds. 

 1.38 

 1.76 

 1.28 

 1.32 



Grain C . ... 



do 



do 



do 



Pounds . 

 4 

 5 

 3 

 6 



Alfalfa hay.. 



do 



do 



do 



Pounds. 

 4 

 4 

 4 

 5 



Corn silage. . 



do 



do 



do 



Pounds. 

 30 

 30 

 30 

 30 



