Nutritional Interrelationships of Dietary Calcium, Phosphorus and Magnesium in Sheep

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Abstract
Four experiments were conducted with 116 wethers to study dietary interrelationships of calcium, phosphorus and magnesium. Including all experiments dietary levels varied as follows: calcium 0.13 to 0.78%, phosphorus 0.12 to 0.36%, and magnesium 500 to 7,750 ppm. Treatment effects on fecal, urinary, plasma and bone mineral levels were observed. In two experiments, the utilization of oral 45Ca and 32P was measured. High dietary calcium increased calcium in plasma (P<.05) and feces (P<.10 to P<.01) and decreased magnesium in bone and plasma (P<.05). High calcium increased fecal phosphorus (P<.01) and tended to reduce plasma phosphorus. Excess dietary magnesium reduced plasma calcium (P<.01), appeared to increase fecal loss of calcium but had no effect on bone calcium. High magnesium increased the level of magnesium in urine (P<.01), plasma (P<.05 to P<.01) and bone (P<.05 to P<.01). High dietary phosphorus with a Ca:P ratio of 1:3 increased fecal calcium (P<.05), but, at a higher level of calcium with a Ca:P ratio of 1:1, phosphorus enhanced calcium retention. Supplemental phosphorus increased plasma phosphorus and reduced plasma calcium (P<.01). Copyright © 1973. American Society of Animal Science . Copyright 1973 by American Society of Animal Science.

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