12 
BULLETIN 1069, TJ. S. DEPARTMENT OF AGRICULTURE. 
ment of low producers or eliminate them. The figures from which 
curves were made cover the period 1910 to 1920, inclusive. When 
prices were high the curves had a slightly different position from 
what they had when prices were low, but always the curves followed 
the same general direction regardless of cost of feed or price of 
.70 
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$ 
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.30 
. 
-4 
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y 
41 
JO 
>50 /OO /50 200 250 300 350 4O0 450 50O S50 
Pig. 7. — Relation between butterfat production per cow and feed cost per pound of 
butterfat. 
product. Within the range of the large groups the high producers 
always won on income over cost of feed on returns for $1 expended 
for feed and on low feed cost per pound of butterfat produced. 
A STUDY OF HERD RECORDS. 
To see whether a study of records by herds would give the same 
results as a study of individual cow records, a tabulation of the herd 
