J. Anim Sci.
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J. Anim Sci. 1985. 60:578-582.
© 1985 American Society of Animal Science
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Effects of Dietary Potassium and Sodium on Magnesium Utilization in Sheep1,2,

J. H. Poe, L. W. Greene, G. T. Schelling, F. M. Byers and W. C. Ellis

Texas A&M University3, College Station 77843

Abstract

Two metabolism trials were conducted to determine the effect of altering dietary Na and K on Mg availability. Three dietary treatments (normal K-normal Na, high K-normal Na and high K-high Na) were imposed upon nine crossbred wether lambs in a randomized block design. Each trial consisted of a 5-d diet adjustment, a 10-d preliminary period and a 5-d collection of feed, feces and urine. Increasing K and Na intake increased the percentage of Mg excreted in feces. Both elevated K and K-Na depressed (P<.10) urinary Mg excretion, primarily a reflection of depressed Mg absorption in animals fed these diets. Apparent K absorption and retention increased when animals were supplemented with K. Addition of Na to the diet did not alter absorption or retention of K. Apparent K and Na availability increased when K and Na supplements were included in the diet. This increased availability resulted from increased total absorbed K and Na compared with a fixed endogenous excretion. Calcium balance in lambs was not affected by addition of K or Na. Lambs were able to absorb enough Mg from their respective diet to maintain normal serum Mg levels. Addition of Na to a diet high in K did not enhance Mg absorption in lambs.

Footnotes

1 Journal paper TA 19670. Texas Agr. Exp. Sta.

2 Reference to a company or trade name does not imply approval or endorsement by the Texas Agr. Exp. Sta.

3 Dept. of Anim. Sci.






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Copyright © 1985 by the American Society of Animal Science.