24 
BULLETIN 945, U. S. DEPARTMENT OF AGRICULTURE. 
Table 7. — Cotos fed alternated rations with phosphate during dry periods before 
calving. 
Period 
during 
which 
weigh- 
ings were 
taken. 
Average 
daily 
gain. 
Average daily ration. 
No. of 
animal. 
Feed. 
Quantity. 
Feed. 
Quantity. 
Feed. 
Quantity. 
17 
21 
50 
71 
81 
Days. 
52 
80 
30 
30 
31 
Pounds. 
0.93 
1.57 
2.50 
1.87 
1.03 
Grain CP . . . 
Grain CP!.. 
do 
Grain CP... 
do 
Pounds. 
4i 
6 
5 
3 
3 
Alfalfa hay.. 
do 
do 
do 
do 
Pounds. 
4 
5 
4 
4 
3 
Corn silage . . 
do 
do 
do 
do 
Pounds. 
30 
30 
30 
30 
30 
It seems worth while to give in more detail the histories of two 
animals of which the weight changes on the experimental feeding 
were followed for comparatively long periods. 
Heifer 74 was born October 15, 1916. From October 19, 1918, to 
January 15, 1919, she was fed alternated rations with phosphate, re- 
ceiving as a daily average 3 pounds of grain mixture CP 15 4 pounds 
alfalfa hay, and 30 pounds corn silage. She was farrow during this 
period. Her weights were as follows : October 24, 1918, 754 pounds ; 
November 23, 1918, 804 pounds; December 23, 1918, 890 pounds; 
January 12, 1919, 930 pounds. 
Cow 21 was born in 1907. From August 28 to November 30, 1918, 
she was fed alternated rations with phosphate, receiving as a daily 
average 6 pounds of grain mixture CP 1? 5 pounds alfalfa hay, and 30 
pounds corn silage. She had calved November 7, 1917, and became 
dry September 6, 1918. She calved again November 30, 1918. 
During the period of phosphate feeding her weights were as follows : 
September 2, 1,027 pounds; October 2, 1,107 pounds; November 1, 
1,143 pounds; November 21, 1,153 pounds. 
Her best previous month's record for milk yield on the Belts ville 
farm was made in October, 1914, and amounted to 1,041 pounds. Af- 
ter this her milk yield gradually fell off ; the best month's production 
after the 1917 calving was 469 pounds. She was in A^ery good con- 
dition when she calved in 1918; in December, 1918, she produced 
1,276 pounds of milk, and in January, 1919, 1,315 pounds. 
These two cases show clearly that sodium phosphate may be fed 
to cows for long periods in large amounts without producing any 
deleterious effects on the digestive and assimilative processes. 
QUANTITATIVE RESULTS. 
In Table 8 and figure 3 an attempt is made to estimate how much 
the alternated feeding with phosphate increased the milk yield in 
the cows of the general herd under the conditions of our experiments. 
The column headed "Expected yield after alternated rations with 
