Article: Substitution of Casein by [beta]-Casein or of Whey Protein Isolate by [alpha]-Lactalbumin Does Not Affect Mineral Balance in Growing Rats1

ABSTRACT

Bovine milk protein fractions that enable modification of the protein composition and amino acid profile of infant formulas to mimic those of human milk have recently become available. To determine the effects on protein quality and mineral bioavailability of replacing casein by β-casein and of whey protein isolate by α-lactalbumin, 4 groups of growing rats were fed for 3 wk diets containing 10% protein as 1) casein (control); 2) β-casein; 3) casein:whey (40:60); or 4) β-casein:α-lactalbumin (40:60). Protein quality, determined as protein efficiency ratio (PER), net protein utilization (NPU), biological value (BV) and protein digestibility (PD), as well as ...

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