Much attention has been recently given to the standardization of records so that comparisons can be made between the production of cows that have made their records under different conditions. The dairy cattle registry associations have recognized an effect of four factors on the production of cows and have set up classes which are governed by these factors in somewhat the same way. These factors are : (a) age of cow at beginning of test, (b) length of production period, (c) frequency of milking, and (d) the length of time during the lactation period the cow is carrying a calf.
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C.Y. Cannon (1933) studied this question.
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