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Journal of Dairy Science Vol. 24 No. 11 983-992
© 1941 by American Dairy Science Association ®
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Estimation of Initial Live Weight at Each Lactation of Dairy Cows1

W. L. Gaines

Illinois Agricultural Experiment Station, Urbana

H. P. Davis and R. F. Morgan

Nebraska Agricultural Experiment Station, Lincoln

ABSTRACT

An equation is derived for estimating initial live weight (live weight within 31 days after calving, in distinction to live weight at other or mixed stages of lactation) from chest girth. The equation is W = .342 (G + g)1.85, where W is initial live weight in pounds, G is actual chest girth in inches and g is a girth modifier for age and breed of cow, being zero for Jersey cows under 3 years of age and ranging up to 9 for Holstein cows 5 years of age or older. The equation permits a compact girth-weight table which is imprinted on the case of a steel tape rule used to measure the chest girth. As compared with the present girth-weight scale the scale of the New York girth-weight tape grossly overestimates the weight of large cows and grossly underestimates the weight of small cows, as much as 20 per cent. This fault of the New York tape is inherent in any formula derived from mixed data, with respect to breed, age, stage of lactation, and gestation.

FOOTNOTES

1 This paper is the result of a cooperative arrangement between the Nebraska and Illinois Stations, whereby the chest-girth and live-weight measurements made at the Nebraska Station over the past 19 years have been utilized at the Illinois Station to derive a formula for the purpose of estimating live weight from chest girth at one particular stage of lactation, namely, within the first 31 days after calving. Printed with the approval of the Director of the Nebraska Agricultural Experiment Station as Journal Series 292; and with the approval of the Director of the Illinois Agricultural Experiment Station.






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Copyright © 1941 by the American Dairy Science Association ®.