The Importance of the Source of Isolated Soybean Protein in Nutrition

A large number of studies on the zinc requirements of poultry have been conducted with purified diets containing isolated soybean protein obtainable from the Dracket Co., Cincinnati, Ohio, and later from Archer Daniels Midland Co. of the same address, under the trade name of ADM-Assay Protein C-l (ADM-C-1). This particular preparation has become unavailable and nutritionists have been forced to consider other materials. We have compared ADM-Assay protein C-l with Assay Protein C-l obtainable from Skidmore Enterprises, Cincinnati, Ohio, (Skid-C-1) and RP-100 obtainable from Ralston Purina Co., St. Louis, Missouri. The results of our experiments in which a comparison of these sources of isolated soybean protein was made for the growth of turkey poults are given in this report. The composition of the zinc deficient diet is given in Table 1. The protein source was added at a level of 330 gm./kg. diet. In the absence of any supplementary zinc, …