CALCIUM AND PHOSPHORUS IN THE FEED OF DAIRY COWS. 21 
Cow 5 If. — This cow aborted during the phosphate feeding 28 days 
before term. Judging from the history of such cases in the general 
herd, her milk yield should have been about 10 per cent less than 
after the control feeding. We have no way of accounting for the 
actual increase except as the result of the phosphate feeding. 
Cows 63, 71, and 81. — The remaining three animals of Table 1 
were fed on the control rations before their first calves were born 
and on the experimental rations before their second calves were 
born. It is well known that heifers are likely to give more milk 
with their second than with their first calves; the average increase 
has been worked out by Pearl and Patterson (14) for Jerseys, and 
the department has figures obtained from the cow-testing associa- 
tions for Guernseys and Holsteins. In Table 8 we have given the 
actual and expected increases ; in calculating the expected differences 
we have in each case used the set of figures which would give the 
largest differences, in order to avoid any possible suspicion of favor- 
ing the results of the phosphate feeding. The milk yield of all 
three heifers increased after the phosphate feeding decidedly more 
than would be expected as the result of age alone. We have no 
way of accounting for the additional increases except as the result 
of the phosphate feeding. 
Table 2. — Animals from the general herd used only either as experiment or 
control animals. 
CONTROLS. 
No. of animal. 
Date of birth. 
Breed. 
Date of 
calving. 
Days dry. 
Milk 
yield. 1 
Fat 
yield. 1 
59 
Aug. 10,1915 
Oct. 18,1915 
Sept. 26, 1915 
Grade Holstein 
do. 
Dec. 26,1917 
Feb. 6,1919 
Feb. 6,1918 
Days. 
First calf 
62 
Pounds. 
568 
1,108 
742 
Pounds. 
20.5 
64 
40.1 
213 
First calf 
26.7 
EXPERIMEN 
T ANIMALS. 
21 
1907 
Grade Jersey 
Grade Holstein 
Grade Guernsey. . . 
Nov. 30, 1918 
April 20, 1918 
Jan. 27,1919 
May 27,1918 
85 
1, 458 
753 
588 
1,554 
60.9 
67 
Dec. 29,1915 
April 22, 1916 
Mar. 18,1916 
First calf 
do 
do 
26.3 
70 
28.3 
214 
46.8 
1 The figures given in these columns represent the number of pounds of milk or fat given from the 10th t o 
the 40th day after calving. 
The animals whose histories are tabulated in Table 2 were used 
in early experiments in which we were still feeling around for the 
conditions under which the effects of the phosphate feeding would 
stand out most sharply and in which the treatment of the subjects 
was not so carefully controlled as in the later experiments. The 
results, however, are in general accord with those of the later experi- 
ments, and it has seemed to us worth while to report them. 
