The same milk production wai obtained in these tests from cows fed computerformulated least-cost concentrate mixes as from cows fed mixes formulated by hand. An average price reduction of $3.10 per ton resulted from feeding the least-cost mixes to 295 cows in five feeding trials.

James Quick and J. M. Rible of the Agricultural Extension Service Regional Laboratories, Davis and Riverside, made the chemical analyses of the feed samples. T. M. Little, Extension Biometrician, and J. A. Shockley, Extension Programmer, did the statistical analyses; and R. C. Laben, Director, University of California Computer Center, Davis, assisted in adapting the computer for the least-cost ration formulations.