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Effect of Dietary Organic Phosphorus on Magnesium Metabolism in Sheep

Virginia Polytechnic Institute¹, Blacksburg

Abstract

Three mineral balance trials were conducted with eight yearling wethers to study the effect of dietary organic phosphorus on magnesium metabolism in sheep fed purified rations containing two dietary magnesium levels. Four purified rations, containing the following magnesium levels and forms of phosphorus, were fed: (1) 0.13% magnesium, inorganic phosphorus; (2) 0.26% magnesium, inorganic phosphorus; (3) 0.13% magnesium, organic phosphorus; (4) 0.26% magnesium, organic phosphorus.Inorganic phosphorus was supplied as the monobasic and dibasic salts of sodium phosphate, and organic phosphorus as phytic acid. All rations contained approximately 0.4% calcium and phosphorus.

The form of dietary phosphorus had no significant effect on absorption and retention of magnesium and calcium, and on absorption of phosphorus. Phosphorus retention was higher (P<.01) for the inorganic phosphorus rations. Magnesium absorption was significantly (P<.01) higher for the high-magnesium (0.26%) rations, when expressed as grams per day, but not when expressed as percentage of intake. Magnesium retention, expressed as grams per day or percentage of intake, was higher (P<.01) for the high-magnesium rations. Blood serum magnesium values decreased from the beginning to the end of trials in sheep fed the low-magnesium rations and increased in those fed the high-magnesium rations (P<.01).The decrease in serum magnesium levels for the low-magnesium rations and the increase for the high-magnesium rations were greater when inorganic phosphorus was fed than when organic phosphorus was fed (magnesium level x phosphorus form interaction was significant) Blood serum calcium and inorganic phophorus level were not significantly affected by form of phosphorus or magnesium level.

¹ Departments of Animal Science and of Biochemistry and Nutrition.

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