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Journal of Dairy Science Vol. 51 No. 7 1073-1076
© 1968 by American Dairy Science Association ®
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Reference Base, Wb, of Growing Steers Determined by Relating Forage Intake to Body Weight1,2,

M. W. Colburn3 and J. L. Evans

Department of Animal Sciences, Rutgers—The State University, New Brunswick, New Jersey

ABSTRACT

Data were analyzed for computation of the correct reference unit, Wb, from 108 forage intake trials using 13 steers (147 to 488 kg). Dry matter intakes ranged from 4.02 to 8.75 kg per day and the average daily weight gain per animal was 0.65 kg. The regression of log Y on log X yielded, in exponential form, the linear equation Y = 0.297 X0.54 where Y is dry matter intake per day (kg) and X is body weight (kg). The coefficient of variation was 13%, and the coefficient of correlation was 0.77. The standard error of the regression coefficient, 0.54, was 0.04. When the exponent 0.75 was forced upon the data, the equation changed to Y = 0.091 X0.75 with a coefficient of variation of 14%. When dry matter intakes were estimated for varying animal sizes using each equation, the 0.54 equation allowed greater dry matter intakes to the smaller animals and less to the larger animals. The cross-over point was at 300 kg body weight. For growing steers W0.54 was a more effective reference unit for equating the intake of dry matter which contains 48% or more cell-wall constituents than was the W0.75 used for mature animals.

FOOTNOTES

1 Paper of the Journal Series, New Jersey Agricultural Experiment Station.

2 Data in this paper are from a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

3 Present address: H. K. Webster Company, Lawrence, Massachusetts.






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