RELATION OF PRODUCTION TO INCOME FROM COWS. 
15 
As milk production increased from Groups 1 to 9, there was a rapid 
and very constant increase in income over cost of feed. Beyond Group 
9 the number of records in each group was small. In Group 1 the 
average production of milk was 1,662 pounds and the average income 
over cost of feed was $3.47. In Group 9 the average milk production 
was 13,250 pounds and the average income over cost of feed was 
$218.19. The milk production per cow in Group 9 was about 8 
times as much as in Group 1, but the average income over cost of feed 
in Group 9 was about 62 times as great as in Group 1. This differ- 
ence was not caused by increased price received for milk, as the aver- 
age price of milk in Group 9 was lower than in Group 1. The price 
of milk, however, did not vary greatly within the larger groups. 
$220 
200 
180 
160 
140 
120 
100 
80 
60 
40 
20 
— I -. 
J 500 3000 4500 6000 7500 9000 10500 12000 13500 I 
POUNDS OF MILK PER COW 
Fig. 8. — Relation between milk production and income over cost of feed. 
5000 
Figure 8 shows the relation of milk production to income over cost 
of feed as given in Table 6. 
This chart, which includes only the larger groups, is very similar 
to figure 3, which shows the relation of butterfat production to 
income over cost of feed. The line is very nearly straight. It shows 
not merely that large producers have a larger income over cost of feed 
than small producers, but it measures the increased income over cost 
of feed in dollars. A herd of 62 cows like those in Group 1 would be 
required to produce as innich income over cost of feed as was produced 
by the average cow in Group 9. 
