A Comparison of Feed Grade Tallow and Acidulated Soapstocks in Practical Chick Starter Rations ,

THE considerable body of literature concerning the use of fatty materials in poultry rations contains little information about the nutritive properties of acidulated soapstocks. Renner and Hill (1958) found a sample of acidulated soapstocks to contain 3,150 Cal. metabolizable energy (M.E.) per pound which suggests that this material compares favourably with many tallows as a source of feed energy. Sibbald et al. (1962) reported that a sample of acidulated soapstocks, fed to growing chicks at a level of 20% of the diet, contained 3,530 Cal. M.E. per pound; further it was noted that by combining tallow and soapstocks in equal proportions by weight the chicks were better able to utilize the energy therein. This synergistic relationship between tallow and acidulated soapstocks was also observed in the weight gain data even when corrections were made for differences in dietary energy content. Experiments to determine the M.E. values for fats are usually …