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Effect of Dietary Protein Source and Corn Oil and Cellulose Levels on Strontium-calcium Discrimination in Growing Rats^{1 ,2}

Department of Animal Science, The Pennsylvania State University, University Park, Pennsylvania

The effect of diet composition on strontium-calcium discrimination in the growing rat was investigated using tracer doses of ⁸⁹Sr and ⁴⁵Ca administered by stomach tube to both sexes in a 2 x 2 x 3 factorial experiment whose variables in addition to sex (S) were protein (P), casein or zein at a 20% dietary level, cellulose (C), at a 3 or 12% dietary level, and corn oil (CO), at a zero, 4 or 8% dietary level. Criteria of response were the 2-hour disappearance of each isotope from the gastrointestinal tract, content of each isotope in the femurs and blood serum (expressed as percentage of administered dose) and the following ⁸⁹Sr/⁴⁵Ca ratios; that absorbed from the gastrointestinal tract, that contained in femurs and that contained in blood serum. Significant main effects of treatments were: casein produced 41 and 42% greater absorption and 48 and 59% greater femur content of ⁸⁹Sr and ⁴⁵Ca, respectively, than zein, but did not alter either ⁸⁹Sr/⁴⁵Ca absorbed or ⁸⁹Sr/⁴⁵Ca in femurs. Casein produced a 69% reduction of serum ⁴⁵Ca as compared with zein which caused the ⁸⁹Sr/⁴⁵Ca in serum to be 534% greater than the value for zein. When dietary cellulose increased from 3 to 12%, ⁸⁹Sr of bone and ⁴⁵Ca of serum were decreased by 21 and 25%, respectively. Male rats had 34 and 14% smaller quantities of femur ⁸⁹Sr and ⁴⁵Ca, respectively, than females. The main effect of dietary level of CO was nonsignificant. Significant interactions for respective criteria were: absorbed ⁴⁵Ca, C with CO; bone ⁸⁹Sr, C with CO; bone ⁴⁵Ca, C with CO; ⁸⁹Sr/⁴⁵Ca in femur, P with S and P with CO; serum ⁸⁹Sr, P with C; and serum ⁴⁵Ca, P with C and S with C.

² Supported in part by AEC Research Contract no. AT(30-1)-3470.

³ Department of Dairy Science. Present address: Department of Dairy Science, Virginia Polytechnic Institute, Blacksburg, Virginia 24060.

⁴ Present address: Virginia Cooperative Wildlife Research Unit, 105 Price Hall, Virginia Polytechnic Institute, Blacksburg, Virginia 24060.

Manuscript received 18 May 1968.