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The Effect of Particle Size on the Utilization of Bone Meal and Limestone by Beef Cattle¹

Nebraska Agr. Exp. Sta. and UT-AEC Agr. Res. Program²

Abstract

Two feeding trials and a radioisotope experiment were conducted to determine the effect of particle size of limestone and bone meal on the utilization of calcium and/or phosphorus by growing beef cattle. The comparisons in the utilization of the mineral supplements of different textures in the two feeding trials were measured by the feed lot performances, blood calcium and phosphorus studies and breaking strength of bones. Radioactive calcium was used to determine the availability of calcium from fine- and coarse-textured limestone in a separate experiment.

The results obtained in the feeding trials and the isotope experiment indicate that the coarse- and fine-textured limestone and bone meal were of equal value as mineral supplements for growing beef cattle.

¹ Published with the approval of the directors of Nebraska and Tennessee Agricultural Experiment Stations as Paper No. 660, Journal Series. The authors wish to acknowledge the assistance of W. J. Loeffel, C. H. Adams and George Royster. Acknowledgment is also made to Swift & Company, Chicago, Illinois for supporting a part of this study through a grant-in-aid.

² The feeding experiments reported in this article were conducted at the Nebraska Exp. Sta. and the isotope studies at UT-AEC Agr. Res. Program, Oak Ridge, Tenn.