Corn silage production in San Joaquin County has doubled in the last five years because of higher yields, as well as increased acreage. Because much of this silage is used for dairy cattle feed, and little information has been available as to its relative value under current California conditions, feeding trials were needed.

The Deuel Vocational Institution, Tracy, furnished the cows, facilities, personnel, and feed for the experiment. The University of California Agricultural Extension Service Laboratory at Davis conducted the chemical analyses.