Abstract
Feeding trials tested a computer program to formulate rations which result in maximum income above feed costs from lactating dairy cows. Factors considered by the computer include feed prices, milk prices, milk production with varying levels of nutrients, maximum voluntary feed intake, and productive ability of the cow. The first trial involved 12 cows in a double-reversal design at the University of California Davis Experiment Station whereas the second test was a field trial under commercial conditions in the 180-cow dairy herd at Deuel Vocational Institution, Tracy, California. Cows fed the computer-formulated rations returned $15 to $21 more income above feed costs per year than cows fed control rations formulated and fed according to management practices in effect in the herds before initiation of the trials.
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