CALCIUM AND PHOSPHORUS IN" THE PEED OF DAIRY COWS. 23 
reduced to negligible proportions in the case of cows which 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 
81 
214 
Days. 
20 
60 
180 
59 
Pounds. 
1.75 
0.65 
1.04 
0.90 
Grain C 
do 
Grain E 
GrainC 
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 with phosphate ; No. 10 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 CP X . . 
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 
