J. Anim Sci.
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J. Anim Sci. 1973. 36:986-993.
© 1973 American Society of Animal Science
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Nutritional Interrelationships of Dietary Calcium, Phosphorus and Magnesium in Sheep1

C. F. Chicco2, C. B. Ammerman, J. P. Feaster and B. G. Dunavant3

University of Florida,,4 Gainesville 32601

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).

Footnotes

1 Florida Agricultural Experiment Stations, Journal Series No. 4550.

2 Present address: Seccion Zootecnia, Centro de Investigacones, Maracay, Venezuela.

3 The authors wish to acknowledge Basic Chemicals, Cleveland, Ohio, the National Feed Ingredients Association, Des Moines, Iowa, and the Center for Tropical Agriculture, University of Florida for funds in support of this study: Monsanto Chemical Company, St. Louis, Missouri for providing Santoquin; and Dawe's Laboratories, Inc., Chicago, Illinois for supplying vitamins A and D. Chandra B. Aulsbrook, Barbara King, E. H. Coats and G. R. Renshaw are acknowledged for their technical assistance.

4 Department of Animal Science and Division of Nuclear Science.






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Copyright © 1973 by the American Society of Animal Science.