Effect of Dietary Protein and Phosphorus Levels on Calcium and Phosphorus Metabolism of the Young, Fast Growing Rat
- 1 April 1981
- journal article
- research article
- Published by Elsevier in Journal of Nutrition
- Vol. 111 (4), 708-720
- https://doi.org/10.1093/jn/111.4.708
Abstract
Utilizing a 2 × 2 factorial design, male weanling rats were fed diets containing either 25% or 45% casein with 0.35% or 0.8% phosphorus (P). Dietary calcium (Ca) was set at 0.9% for each diet. During the 7 weeks of this experiment, food intakes and body weights were measured weekly; urine and fecal samples were collected daily. Regardless of dietary P level, increasing dietary protein resulted in significantly decreased fecal Ca output accompanied by an increase in the Ca content of urine. Increasing dietary P resulted in significantly increased fecal Ca content, decreased absolute and percent Ca absorption, and decreased urinary Ca output. Increased fecal and urinary P excretion were obtained when dietary P levels were increased. Increasing dietary protein at the 0.35% P level slightly increased the values for absolute and percent Ca and P absorption. However, when 0.8% P was fed, increasing the protein level of the diet decreased these Ca (weeks 1–5) and P absorption values. Ca and P balances were positive at all times.Keywords
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