Abstract
IN THE spring of 1942 Milby and Thompson (1943) found that D-activated animal sterol lost a large part of its vitamin D activity when premixed with salt and calcium carbonate and stored for three weeks before mixing the feed. Fritz and co-workers (1942) have reported that vitamin D from fish liver oil concentrate was unstable when mixed with a wide variety of feed ingredients.In view of the above findings it appeared desirable to investigate the stability of vitamin D from D-activated animal sterol when premixed with various feed ingredients.EXPERIMENTALThe following turkey starter mash was used as a base in all trials: ground yellow corn, 22; wheat shorts, 10; wheat bran, 10; ground barley, 12; dehydrated alfalfa meal, 6; meat and bone scraps, 10; cottonseed meal, 12; soybean oil meal, 12; dried buttermilk, 5; salt, 0.5; total 99.5.On Feb. 13, 1943, 22.7 grams of D-activated animal sterol .
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