Abstract: Compositions comprising feedstocks with high oleic acid content for ruminant feed, calcium soaps of the feedstocks, and methods of preparing ruminant feed and its use to increase fatty acid digestibility, increase milk production, increase milk fat, or increase body fat deposition in cows are presented. The high oleic acid feedstocks include from about 50 wt % to about 70 wt % oleic acid; no more than about 25 wt % polyunsaturated fatty acids; and unsaturated fatty acids, wherein less than about 20% of the fatty acids are present as a glyceride.