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Age, Live Weight and Milk-Energy Yield in Illinois Cows

University of Illinois, Urbana, Illinois

ABSTRACT

In a previous article it was mentioned (1, footnote 6) that a plan of using live weight in connection with Dairy Herd Improvement Association records was under trail. This paper reports some of the results of that trial, dealing with all the Holstein (957) and Jersey (195) records available covering the first 8 monthly tests of the lactation without interruption. The records were all made under farm conditions, milking twice daily. It is impossible to deal with the records beyond the 8th month without in many cases encountering serious disturbances associated with advanced pregnancy and with management practice. Comparisons are simplified and biological meanings are clarified by dealing with the first 8 months of lactation (when the usual calving interval is 12 months) as compared with trying to deal with the whole lactation, or with fiscal year records. This fact was recognized by Gowen (2) as early as 1920, but the merits and advantages of the system are not yet generally appreciated.

¹ Acknowledgment is made to the several testers who secured the live weights and reported the records of the cows on which this paper is based.