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Strontium Retention in the Bovine

University of Nevada, Reno

Abstract

Thirty-six yearling Hereford heifers were assigned at random to a 2x3 factorial experiment involving two levels of calcium (0.13 and 3.1%) and three levels of strontium (13, 200 and 2000 ppm) for a 100-day period. Digestion studies were conducted each month during the study. Caudal vertebrae biopsies were taken on all animals at the beginning of the study and at 50-day intervals thereafter.

High-calcium diets reduced weight gains, and the digestibility of both dry matter and energy. The various strontium levels had no effect on these criteria. The amount of strontium in bone ash increased with each added increment of strontium in the diet. However, the amount deposited was reduced by high-calcium additions. The calcium, phosphorus and strontium content of the left femur, eighth rib or caudal vertebrae were similar. Stable strontium and calcium had no significant effect on the percent phosphorus or calcium in caudal vertebrae ash. Dietary calcium and stable strontium fed for 100 days had no effect on the retention of strontium-89, but more strontium-89 was stored in the eighth rib and caudal vertebrae than the left femur (P<.01).

¹ Supported in part by Contract No. AT(04-3)-509 from the United States Atomic Energy Commission. Contribution of the Nevada Agricultural Experiment Station J. S. No. 56.