J. Anim Sci.
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J. Anim Sci. 1979. 48:954-960.
© 1979 American Society of Animal Science
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Effects of Dietary Calcium Levels on Concentration and Solubility of Macro Minerals in the Digestive Tract of Sheep

H. Yano, H. Matsui and R. Kawashima

Kyoto University, Kyoto 606, Japan1

Abstract

Digesta samples were collected from rumen, omasum, abomasum, upper small intestine, middle small intestine, lower small intestine, cecum and colon to study the effects of dietary calcium levels on the concentration and solubility of minerals in the digestive tract of sheep.

Calcium concentrations in digesta and supernatant increased and calcium solubilities tended to become lower with the elevation of dietary calcium level. In comparison with the concentrations of calcium, magnesium and potassium, the concentrations of phosphorus and sodium in digesta and supernatant were higher in the rumen and the omasum.

A net absorption of calcium appeared to occur in the upper small intestine and that of phosphorus in the middle and the lower small intestine. Similar to calcium, a decrease in phosphorus solubility was found in the lower small intestine when high calcium rations were given. Supernatant concentrations of magnesium, sodium and potassium increased in the upper small intestine and decreased in the middle and lower small intestine. Although calcium, phosphorus and magnesium concentrations in digesta and supernatant did not decrease in the cecum and the colon, sodium and potassium lowered in these sites.

Footnotes

1 Department of Animal Science, College of Agriculture






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Copyright © 1979 by the American Society of Animal Science.