J. Anim Sci.
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J. Anim Sci. 1985. 60:709-714.
© 1985 American Society of Animal Science
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Development of an Assay to Determine the Bioavailability of Potassium in Feedstuffs for the Young Pig1

Nadine Rae Combs2,3,, E. R. Miller2 and P. K. Ku2

Michigan State University, East Lansing 48824-1225

Abstract

A series of four trials was conducted to verify the published requirement of .26% total K in the diet and to identify response variables useful in an assay of the bioavailability of K in feedstuffs for the young pig. Purified diets were supplemented with K at four levels as KC2 H3 O2 in three trials and as KHCO3 in the fourth trial. In the first three trials, the requirement was estimated by least-squares analysis of a linear-plateau response of average daily gain. Additional measures in each trial were taken for linear response to dietary K levels. The three estimates of K requirement obtained were .30, .33 and .26% total K in the diet. These three estimates were not found to be inconsistent with the published value of .26% total K in the diet. Various urinary and hematological measures also were examined during the four trials for linear response to dietary K levels. Plasma K was the only hematological response to show a significant linear relationship to dietary K levels. Urinary K concentrations and daily excretion showed a highly significant linear response to dietary K levels. Based on these results, a K bioavailability assay using urinary K measures as the primary response variable and plasma K as the secondary response variable seems the most promising.

Footnotes

1 Journal Article No. 11323 of the Michigan Agr. Exp. Sta.

2 Anim. Sci. Dept.

3 Present address: Anim. Sci. Dept., Virginia Polytechnic Institute and State Univ., Blacksburg 24061.






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Copyright © 1985 by the American Society of Animal Science.