Abstract
The influence of high dietary intakes of protein and energy on bone development was described and the accuracy of radiographic photometry as an estimator of bone mineral content was determined. There were higher (P<.10) values for breaking strength and cortical area, and lower (P<.10) percentages of calcium and total mineral content in the bones of ponies on high planes of nutrition. These ponies developed at a faster rate than the normally fed ponies, suggesting that during accelerated growth bone mineral deposition may be reduced. Thus, high intakes of energy and protein appeared to increase the rate of skeletal growth while decreasing deposition of mineral into bone. These conditions may be related to bone failure from high compressive loads. Radiographic photometry was found to be an adequate predictor of bone mineral, calcium and phosphorus content in live ponies. However, care must be used in obtaining the radiographs to ensure the accurate estimation of mineral status.
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