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Effects of Dietary Composition on Serum Calcium and Serum Alkaline Phosphatase Activity in the Growing Rat¹

Nutrition Division, Department of Animal Sciences Rutgers—The State University, New Brunswick, New Jersey

ABSTRACT

One hundred forty-four growing male rats were used to study the effect of calcium (0.19, 0.48, and 0.78%), lactose (0 and 12%), EDTA-acid (0 and 0.2%), and buffering capacity of the diet (BC, 0.46, 0.54, and 0.76 ml of N HCl required to reduce pH of 5 g of the diet suspended in 45 ml distilled deionized water by 1 pH unit) on serum calcium and alkaline phosphatase (SAP). The arrangement of treatments was a complete factorial (3 x 2 x 2 x 3), which allowed all possible combinations of the dietary variables in 36 diets, with four replicates for each. Serum calcium increased with increased dietary calcium and 12% lactose. Serum alkaline phosphatase increased with increased calcium intake, dietary BC, and feeding EDTA-acid. Increased serum calcium was related to increased total calcium absorption, whereas increased SAP reflected the decreased feed intake and decreased efficiency of calcium absorption.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers—The State University, New Brunswick.