Previous investigations have shown the correlation that exists between the changes in age and milk production of dairy cows when the cows are kept under official testing conditions.Many cattle breeders have wondered whether or not the results of those investigations could be applied with accuracy to conditions such as those under which a cow is not being fed and managed for an official record.It is important that the truth be known concerning the correlation of changes in age and milk production of cows kept under other than official test conditions, since a very small percentage of the dairy cattle of the country are tested for official record.For these cows without official test, there is a need for age correction factors, such thag can be used with the immature record of a young cow so as to predict the probable mature production of that animal.With the use of such factors the breeders can tell how profitable the young cow will be when she becomes mature, with at least a fail" degree of accuracy.In order to determine age correction factors for other than official test conditions, the author has studied records from the experiment station herds of the following colleges and universities:
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Roberta. Clark (1924) studied this question.
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