Iodinated casein. Use in feed supplements: Kohler, The Use of Thyroactive Protein in Dairy Cattle Feeding, The Texas Nutrition Conference Oct. 1953, Abstracts of papers, pp 5-7. Prepn: Reineke et al., J. Biol. Chem. 143, 285 (1942); 147, 115 (1943); Turner, Reineke, US 2329445, US 2379842, US 2385117, US 2478065 (1944, 1945, 1945, 1949 to Am. Dairies & Quaker Oats); Whitmoyer, Moore, US 2382193 (1945 to Whitmoyer Labs.); West, Van Bruggen, US 2642426, US 2709671 (1953, 1955 to Feed Prods).