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Effects of Dietary Calcium Level, Acid Stress, and Age on Renal, Serum, and Bone Responses of Rats1

C. Kathleen Newell2 and Roy E. Beauchene

Department of Nutrition, Agricultural Experiment Station, and College of Home Economics, University of Tennessee, Knoxville, Tennessee 37916

The effects of age and acid stress on renal, serum, and bone responses in 13- and 25-month-old rats, which were fed two levels of dietary calcium, 100 and 500 mg/100 g of diet, for 9 months, with and without dietary ammonium chloride (2%), were investigated. Acid-stressed animals showed significant decreases in urinary pH and significant increases in urinary total acid, calcium and phosphorus excretions, kidney weights, and phosphate-dependent glutaminase activities. Renal responses were affected by the level of calcium in the diet and the age of the animal. Acid stress tended to decrease serum calcium and phosphorus. Serum phosphorus was decreased in old animals, while serum calcium was unaffected by age. Tibia ash weights of old animals were significantly less and their fat content was significantly higher than that of young animals. However, neither acid stress nor the level of calcium in the diet significantly affected bone analysis in either age group.

KEY WORDS: • calcium • acid stress • age • kidney • bone • serum

1 Published with permission of the Dean, Tennessee Agricultural Experiment Station and the Dean, College of Home Economics.

2 Present address: Department of Foods and Nutrition, Kansas State University, Manhattan, Kans. 66506.

Manuscript received 1 February 1975.




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Copyright © 1975 by American Society for Nutrition