652 
Journal of Agricultural Research 
Vol. XI, No. 12 
on, a gradual diminution of the average test may be expected, and this 
may accumulate to an appreciable decrease in advanced age. Jersey 
cows, then, do not necessarily “strike their gait” in the first lactation 
period with respect to the average percentage of fat in their friilk. 
Table II .—Relative distribution of highest average test for the lactation period 
JERSEY cows 
Number of cows. 
74 
59 
59 
45 
45 
45 
30 
3o 
3o 
3o 
20 
20 
20 
20 
20 
II 
II 
II 
II 
II 
II 
2 6 
20 
20 
II 
II 
II 
8 . 
8 . 
8 . 
8 . 
6 . 
6 . 
6 . 
6 . 
6 . 
5 - 
5* 
5 - 
5 - 
5 - 
5 - 
Lacta¬ 
tion 
periods. 
2 
2 
4 8 . 
47 . 
3 
2 
3 
4 
39 - 
44 - 
33 - 
26. 
2 40. 
3 
4 
5 
30- 
23- 
16. 
2 
3 
4 
5 
6 
2 
3 
4 
5 
6 
7 
30. 
20. 
15- 
iS- 
J 5- 
27. 
18. 
18. 
18. 
18. 
18. 
2 
2 
3 
2 
3 
4 
2 
3 
4 
5 
2 
3 
4 
5 
6 
2 
3 
4 
5 
6 
7 
88 . 
90. 
70. 
100. 
81. 
63- 
100. 
100. 
87. 
87. 
100. 
100. 
100. 
100. 
33- 
100. 
100. 
100. 
100. 
83- 
83. 
Proportion of cows showing highest test in period— 
2 « 
3 
4 
s 
6 
7 
7 
5 
0 
5 
3 
7 
0 
0 
3 
7 
0 
0 
0 
0 
0 
3 
2 
2 
2 
2 
2 
5 1 - 3 
5 2 - 3 
32.2 
55*5 
33*3 
33-3 
60.0 
36-7 
3 6 - 7 
30.0 
70. O 
40 . O 
40 . O 
35 -o 
35 - o 
72.7 
36* 4 
3 6 - 4 
3 6 -4 
3 6 -4 
3 6 -4 
28.8 
* 
33-3 
28. 9 
11.1 
33-3 
30.0 
30.0 
10. 0 
10. 0 
13-3 
40.0 
40. 0 
40. 0 
40. 0 
5-o 
5-o 
5 -o 
5 -o 
5 -o 
O. O 
45 - 5 
45-5 
45-5 
45-5 
45-5 
0. 0 
0. 0 
0. 0 
0. 0 
0, 0 
0. 0 
0. 0 
0. 0 
0. 0 
0. 0 
HOLSTEIN COWS 
5 
I 
ii- 5 
0 
10. 0 
0 
10. 0 
20. 0 
0 
0. 0 
8 
0. 0 
18. 2 
18. 2 
7 
0. 0 
18. 2 
t 
0 
0. 0 
0 
0. 0 
0. 0 
c 
0. 0 
0. 0 
12. 5 
12. 5 
5 
0 
0. 0 
0. 0 
0. 0 
0. 0 
0 
0. 0 
0. 0 
0 
0. 0 
0. 0 
0. 0 
0 
0.0 
0. 0 
0. 0 
0. 0 
2 
0. 0 
0. 0 
0. 0 
0. 0 
0. 0 
16. 7 
0 
0 
0 
0. 0 
0. 0 
0 
0. 0 
0. 0 
0. 0 
0 
0. 0 
0. 0 
0. 0 
0. 0 
7 
0. 0 
0, 0 
0. 0 
0. 0 
16. 7 
0 
3 
0. 0 
0. 0 
0. 0 
0. 0 
16. 7 
0. 0 
