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Determination of Potassium Availability in K₂CO₃, KHCO₃, Corn and Soybean Meal for the Young Pig¹

Michigan State University, East Lansing 48824-1225

Abstract

Four trials, each utilizing six weanling pigs from each of four litters, were conducted to determine the relative availability of K in potassium carbonate (K₂C0₃), potassium bicarbonate (KHCO₃), corn and solvent extracted soybean meal (44% crude protein). Potassium acetate was used as the standard (100%) in these trials. After a 10-d depletion period, one pig from each litter was assigned to a diet containing one of three levels of K from each source. Urine, fecal and plasma samples were collected and analyzed for K concentration, and K excretion values were calculated. Daily K retention was the only response measured that provided a significantly linear relationship to daily K intake for all sources. Relative K availability was estimated by the ratio of slopes, of the daily K retention response, for the test source to that of the standard source. Potassium was estimated to be 103% as available in K₂C0₃ and 107% as available in KHCO₃ as the K in KC₂H₃O₂. Relative K availability in corn was determined to be 90 to 95%. Potassium in soybean meal was found to be 97% as available as that of potassium acetate.

¹ Journal Article No. 11321 of the Michigan Agr. Exp. Sta.

² Anim. Sci. Dept.

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