Abstract
Partially hydrogenated soybean oil (IV 107) was used for deep fat frying under commercial conditions until it reached the end of its useful frying life. This used fat, or a fresh fat control, was fed to two male and two female dogs at levels of 15% in a semipurified diet. Their effects were compared to those of a commercial dog feed from shortly after weaning until the dogs were 54 weeks old. There was no apparent difference in the growth of female dogs fed all three diets. The male dogs fed the diet with used fat grew about the same as those fed the commercial dog feed, but both groups had reduced growth compared to dogs fed the diet with fresh fat. As in the rat studies, this reduced rate of growth for males was attributed to the lower absorbability of the used fat compared to the fresh. Otherwise, histopathological and clinical examinations showed that all of the dogs fed the three diets were in good health.

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