RELATION OF PRODUCTION TO INCOME EROM COWS. 
13 
records of many cow-testing associations was made, and is shown in 
Table 5. For comparative figures from individual cow records see 
Table 2. 
The herd records were sorted according to average production of 
butterfat per herd, and the income over cost of feed was determined, 
usual, bv finding the weighted averages of the individual cow 
as 
Table 5. — Relation of butterfat production to income over cost of feed a„s shown 
by a tabulation of the herd records of 1,309 herds where the product was sold 
as butterfat; years 1910 to 1920. inclusive. 
Group No. 
Number 
of 
herds. 
Number 
of 
cows. 
Butterfat pro- 
duction. 
Average 
income 
over 
Range. 
Average. 
cost of 
feed. 
1 
2 
112 
333 
464 
270 
97 
24 
5 
1 
1 
22 
1,556 
4,496 
6,724 
3,443 
1,171 
270 
46 
6 
7 
Pounds. 
76-125 
126-175 
176-225 
226-275 
276-325 
326-375 
376-425 
426-475 
476-525 
526-575 
Pound?. 
119 
161 
205 
251 
297 
344 
391 
451 
496 
526 
$25. 35 
2 
30.56 
3 
41.23 
4 
54.00 
5 
64.49 
6 
81.17 
7 
93. 46 
8 
89.42 
9 
99.40 
10 
45.09 
Total 
1,309 
17, 741 
248 
52.84 
records in each group. As there was no reason to believe that the 
tabulation of more records would materially affect final conclusions 
it seemed useless to carry this tabulation farther, though the number 
of records used in Table 5 was somewhat less than the number used 
in some of the other tables. 
The increase in income over cost of feed as production increased 
is not quite so marked in Table 5 as in Table 2, because in the former 
the records were grouped according to herd averages regardless of 
individual production. Even with that handicap the high-produc- 
ing herds always showed an increased income over feed cost as 
production increased from group to group. The average income 
over cost of feed per cow for the 24 herds in Group 7 was more than 
three times as great as for the 112 herds in Group 2. 
CONCLUSIONS ALWAYS THE SAME. 
Tabulations were made, by breeds, of thousands of records of 
grade and purebred cows to determine the relation of butterfat pro- 
duction to income over cost of feed. In every case the results were 
very similar to those already given. Tabulations for each age of 
each breed also gave similar results, and the results were about the 
same when the records for each association or for any agricultural 
district were tabulated. It seems fair, therefore, to conclude that 
