J. Anim Sci.
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J. Anim Sci. 1968. 27:412-417.
© 1968 American Society of Animal Science
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Use of Tritiated Water to Determine the Effect of Water Restriction on the Insensible Water Loss of Pigs1

H. M. Cunningham2

Canada Department of Agriculture, Nappan, Nova Scotia

Abstract

The insensible water loss of pair-fed pigs was determined by injecting HTO, placing them in a respiration chamber and determining the activity of body water and water removed in air pumped through the chamber. In one experiment, pigs restricted to 1.5 kg. of water per kg. of feed produced 194.2 gm. less (P<.01) insensible water per day than controls at 2.5 kg. of water per kg. of feed. In a second experiment, pigs restricted to 1.25 kg. of water per kg of feed produced 242.6 gm. less (P<.01) water per day than controls at 3.0 kg. of water per kg. of feed. The greater heat expenditure of controls in vaporizing water would allow less energy to be available for the deposition of body fat.

Equilibration of HTO with body water was almost complete within 1 hr. after injection. Total body water calculated from blood HTO 1.5 hr. after the pigs had received their morning allotment of feed and water was 63.1% in controls and 62.0% in restricted pigs in experiment 1 and 64.8% in controls and 57.7% in restricted pigs in experiment 2. The biological half-life of HTO in the body of pigs, determined in the second experiment, was found to be 3.50 days in controls and 6.25 days with water restriction.

Footnotes

1 Contribution No. 213.

2 The author wishes to acknowledge the technical assistance of J. G. Allen, H. A. Harrison, J. D. Nelson and R. T. Ripley.






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Copyright © 1968 by the American Society of Animal Science.