The Growth-Promoting Effect on the Rat of Summer Butter and Other Fats

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Abstract
Rat growth experiments were conducted over a 70-day period in which summer butterfat, margarine fat, cottonseed oil, and olive oil were added at levels of 10% to an otherwise fat free basal ration capable by itself of producing essential fatty acid deficiency symptoms. Using growth and body length measurements as criteria, it is concluded that there are no heretofore unrecognized fat soluble growth factors such as vaccenic acid present in summer butterfat which are not also present to the same extent in margarine fat9 and cottonseed oil. The addition of each of the above fats to a fat free diet produced a significant growth stimulation.