J. Anim Sci.
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J. Anim Sci. 1976. 42:1191-1195.
© 1976 American Society of Animal Science
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Evaluation of Dietary Salt Levels for Swine II. Effect on Blood and Excretory Patterns1,2,3,

Ib Hagsten4 and T. W. Perry

Purdue University, W. Lafayette, Indiana 47907

Abstract

Six experiments utilizing 81 growing crossbred barrows were designed to study the effect of salt (NaCl) supplementation on blood and excretory measurements. The measurements studied were: packed cell volume (PCV), sodium and potassium excretion, and urinary and fecal nitrogen excretion. Conventional corn-soybean meal diets with varying amounts of supplemental salt were fed along with deionized drinking water. Supplemental salt levels studied ranged from .00 to .39% salt, added as sodium chloride.

The PCV values initially decreased with increased salt intake (P<05) until a stabilization point was reached below .14% added salt. The negative correlation between salt intake and PCV was highly significant and up to 31% of the variability in PCV can be accounted for by salt addition. Urinary potassium and nitrogen excretion and fecal nitrogen excretion were not altered by level of salt intake. Total daily urinary and fecal sodium excretion were not increased (P<01) until the salt level was greater than .14% added salt. Sodium excretion primarily, and to a lesser extent PCV, can be used as predictors of physiological salt needs. The close agreement between the results obtained via the two measurements is encouraging.

Footnotes

1 Department of Animal Sciences, Journal Paper No. 5894, Purdue University Agricultural Experiment Station.

2 The research reported herein was presented by the senior author to the faculty in partial fulfillment of the requirement for the degree of Doctor of Philosophy.

3 The authors acknowledge the assistance of Mrs. Alice Bales with the chemical analyses.

4 Present address: King Feed Co., Blandinsville, ILL 61420.






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