Protein evaluation in growing rats of breast milk and breast milk substitutes with special reference to the content of non-protein nitrogen
1979
Forsum, Elisabet | Lonnerdal, Bo
The protein quality of breast milk protein with and without the non-protein-nitrogen (NPN) substances present in human milk was studied with growing rats and compared to four formulas. Protein and amino acid composition are reported. Breast milk protein with added NPN substances showed a lower protein quality than all other test proteins. Breast milk protein without NPN substances and the protein of the suggested, further modified infant formula were of similar quality, while the protein of the commercial adapted formula was significantly better than all other test proteins. The use of rat growth assays in the evaluation of protein quality of infant formulas is discussed.
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