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Progress Report on Comparison of Lactation and Yearly Records

Iowa State College, Ames, Iowa

ABSTRACT

Conclusions: From the results of this study it may be concluded that the Cow Testing Association yearly record tends to repeat itself in succeeding years about as closely as the lactation record does. Therefore a general change to the lactation basis for selecting dairy cows, proving dairy sires, etc., will not lead to any material increase in accuracy. Such a change would be hard to justify if it entails any appreciable amount of additional expense or trouble.

Above all, one should never lose sight of the fact that the conditions under which the records were made are important and allowances for them should be made wherever possible. The individual owner can do this to some extent, but the man who has only the production records with no description of the conditions under which they were made can not even begin to make such allowances.