COMPARATIVE STUDY OF HUMAN MILK AND A SOYA BEAN FORMULA IN PROMOTING GROWTH AND NITROGEN RETENTION BY INFANTS

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Abstract
Four infants, 4 to 6½ months of age, were studied for periods of 38 to 73 days while receiving ad libitum feeding of a formula in which the protein was derived from soya bean. No other source of calories was provided. The content of protein in the formula was 1.14 gm/100 ml (6.8% of the calories supplied by protein) and the mean intake of protein by the infants was 1.7 gm/kg/ day. The amounts of methionine (mean intake, 38 mg/kg/day) and tryptophan (mean intake, 14 mg/kg/day) supplied by the formula were slightly less than currently accepted minimal requirements for infants. The rate of gain in weight of the infants was normal and retentions of nitrogen (15 metabolic balance studies) were at least as great as those of normal full-term infants of similar ages fed human milk. This finding may be of value in consideration of protein allowances for children in technically underdeveloped areas of the world in which soya beans, but not animal protein, are available.

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