Abstract
Summary 1. Cow's milk antibody in the blood of infants was determined using the tannic acid-treated red cell agglutination method. The highest level was found in the infants given completely artificial feeding. 2. Antibody positives were higher in the group in which cow's milk or cow's milk preparations was started before the 15th day after birth compared to those given artificial feeding after the 15th day. 3. Determination of the antibody according to each protein fraction reveals the highest rate for a-casein while the antibody against a-lactalbumin and s-lactoglobulin was low. 4. When α-casein is given orally in the rat, antibody was found only in the animals given α-casein in the newborn stage and could not be observed when given at later stages.
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