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Fractional intestinal Ca absorption was measured in female rats by mixing 47Ca and the nonabsorbable marker 47SC into purified diets and measuring the decrease in the ratio of 47Ca to S'<Y8rsoe feces the diet. Ca absorption in 28-wk-old rats consuming a 0.5% Ca diet was not significantly influenced by replacing whey protein with casein, casein phosphopeptides or phosphoserine. Ca absorption was doubled by adding 4% lactulose in both the presence and absence of casein phosphopeptides. Ca absorption in 56-wk-old rats consuming a 0.2% Ca diet was elevated a modest 26% by increasing the level of dietary casein from 9 to 27%.

Influence of casein phosphopeptides and lactulose on intestinal calcium absorption in adult female rats