Mechanical aspects of rabbit fecal dehydration

McKie, A.T., Naftalin, R.J. and Powrie, W. (1990) Mechanical aspects of rabbit fecal dehydration. American Journal of Physiology: Gastrointestinal and Liver Physiology, 258, G391-394.


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The hydrostatic pressure required to reduce the water content of rabbit feces in an odometer from greater than 80 to less than 65% was approximately 5 atm. This pressure was unaffected by raising the temperature from 20 to 37 degrees C. It became progressively more difficult to dehydrate feces as consolidation occurred, as is evident from the significant (P less than 0.001) reduction in the fecal consolidation coefficient (Co) from 1.76 +/- 0.25 X 10(-6) (n = 4) to 1.35 +/- 0.093 X 10(-7) m2/s (n = 4) and the fecal fluid permeability coefficient (k) from 4.10 +/- 0.51 X 10(-8) (n = 4) to 1.42 +/- 0.12 X 10(-10) m/s (n = 4), concomitant with the reduction in fecal water content. The results suggest that rabbit hard feces are unlikely to be produced, under physiological conditions, by mechanical pressure exerted by the wall of the colon or by a prolonged retention time of hard feces by the distal colon. The hypertonic absorbate (1,000 mosmol/kg) produced by rabbit descending colon is of sufficient magnitude to overcome the fecal resistance to dehydration.

Item Type: Article
Additional Information: McKie A T, Naftalin R J, Powrie W., (1990). "Mechanical aspects of rabbit fecal dehydration." American Journal of Physiology (gastrointest. Liver Physiol.), 258, G391-394
ISSNs: 0193-1857 (print)
1522-1547 (electronic)
Subjects: R Medicine > RC Internal medicine
Q Science > QH Natural history > QH301 Biology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions : University Structure - Pre August 2011 > School of Civil Engineering and the Environment
ePrint ID: 75691
Accepted Date and Publication Date:
Date Deposited: 11 Mar 2010
Last Modified: 31 Mar 2016 13:09

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