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Age, Live Weight and Milk-Energy Yield— A Correction

University of Illinois, Urbana

ABSTRACT

This correction relates to a previous article (1) in which initial live weight (live weight measured within 31 days after calving) was estimated by the New York chest-girth live-weight tape. Since that time a new girthweight scale has been developed (2) for the specific purpose of estimating initial live weight, where age and breed are known. The New York tape is designed without regard to age, breed, or stage of lactation and as compared with the new scale it leads to gross systematic errors in the weight estimates (2).

The old weight estimates may be changed onto the new scale readily since both are based on chest girth. In the present paper this change has been made for those records with age reported and the age-weight-yield relations are re-examined. The yield data used are the eight-months partial lactation milk-energy yields in terms of pounds of four per cent milk per day (FCM).