12 



BULLETIN 1069, U. 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 































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50 IOO /SO 200 2SO 300 3SO 40(? 4SO SOO 

 POUNPS OF BUTTBIZF/IT PER COW 



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 



