Oc 6. 15,1925 
Calcium Phosphate as Supplement to Dairy Ration 779 
At no time has it been possible to note any marked difference in 
the aged cows. There have been times when, as a group, they have 
not been in the best of condition, but this has been true of the whole 
aged herd and not of any particular individual or group. Of the 14 
aged cows with which the experiment was commenced, 9 are still in 
the herd, 4 of them being in the “mineral” group and 5 in the “non- 
mineral” group. (See Table I.) 
Table I .—History and present condition of the aged cows 
Cow No. 
Age 
in 
years 
Breed 
Group 
Number 
Previous 
to com 
mence- 
ment of 
experi¬ 
ment 
of calves 
Since 
com¬ 
mence¬ 
ment oi 
experi¬ 
ment * 
Present 
condition 
(May, 1924) 
6—. 
7 
Grade Holstein 
Nrfhmineral 
1 
2 
Good 
8_ 
12 
_do .. 
_ __ do 
a 1 
2 
Fair 
9_ 
9 
_do__ 
Mineral 
b 1 
e 2 
Good 
10.. 
10 
_do... 
NVvnminoral 
5 
2 
Do' 
11_ 
10 
_do... 
Mineral 
4 
d 2 
Do 
12.. 
7 
_do..... 
do 
1 
3 
Do 
16_ 
11 
Grade Jersey 
NYvnmineral 
6 
2 
Do 
17.. 
11 
Purebred Jersey 
Mineral ' 
7 
2 
Fair. 
19_ 
7 
Grade Jersey ' _ 
Nonmineral_ 
2 
«2 
Good. 
\ 
* This cow was purchased when 7 years old. Her calf record previous to purchase in 1920 is unknown. 
6 Purchased in 1921. Calf record previous to purchase unknown. 
e One of these was aborted at 7 months. 
d One of these was aborted at 5 months. 
In so far as the eye can detect, none of these cows are undernour¬ 
ished or deprived of anything. As seen by their photographs (pis. 
1 and 2), they are above the average in appearance, and even a keen 
observer would see nothing radically wrong with any of them. 
Another group of 6 individuals consists oi 6 young cows which were 
either heifers or calves when the experiment commenced. '(See 
Table II.) 
Table II .—History and present condition of the young cows 
Cow No. 
Age 
in 
years 
Breed 
Group 
Number of calves 
Present 
condition 
(May, 1924) 
Previous 
to com¬ 
mence¬ 
ment of 
experi¬ 
ment 
Since 
com¬ 
mence¬ 
ment of 
experi¬ 
ment 
3. 
3 
3 
5 
4 
4 
3 
Grade Holstein . 
Mineral_ 
None. 
None. 
« None. 
None. 
None. 
None. 
1 
1 
2 
1 
2 
2 
Fair. 
Good. 
Do. 
Poor. 
Very poor 
Poor. 
5_ 
_do_ 
Nonmineral_ 
is 
_do_ 
_do_i_ 
22.. 
Grade Jersey __ 
Mineral 
23.... 
_do. _ 
Nnnmineral _ 
24_ 
_do.. 
Mineral 
° All except No. 15 too young to breed; No. 15 had been bred but had not calved. 
Here the situation is somewhat different. The last three cows in 
the list (pi. 3) are without a doubt suffering from lack of something in 
their ration, and that something is presumably calcium. It is perhaps 
