Studies with Acidulated Cottonseed-Oil Soapstock

IT IS generally accepted that the nutritive values of acidulated soybean-oil soapstock (ASS) and beef tallow are comparable (Bornstein and Lipstein, 1961; Sibbald et al., 1962a, b; Pepper et al., 1962; Artman, 1964; Lewis and Payne, 1966). Such comparisons have not included acidulated cottonseed-oil soapstock (ACS), which differs from ASS by its fatty acid composition (Lipstein, 1967) and by the gossypol it contains. In addition, ACS may contain cyclopropenoid fatty acids which cause the appearance of pink white discoloration in storage eggs (Lipstein and Bornstein, 1966). The biological effects of cyclopropenoid compounds have been reviewed in detail by Phelps et al. (1965). These include an effect on fat metabolism, as shown by an altered fatty acid composition of egg yolks (Evans et al., 1960) and of various tissue lipids of hens (Evans et al., 1962). Feeding of ACS to poultry might therefore affect fat metabolism in a manner similar to…