The influence of right hemicolectomy (RH) on fecal nitrogen excretion
was determined with selected protein levels up to 25%. The endogenous
fecal N was determined by extrapolating protein intake to zero. Fecal
N was higher in RH than in control rats at all protein levels used. Ho
wever, the slope of regression curves describing fecal nitrogen excret
ion was greater for RH compared with the control group. The endogenous
fecal nitrogen was not significantly different between the two groups
of rats. The feces from rats fed with 25% of protein were partitioned
into individual fractions by physical separation and a study was made
of the distribution of nitrogen in the bacterial, soluble and fiber f
ractions of the stool. RH decreased the N excreted in the bacterial fr
action by 33% (from 1.71 +/- 0.32 to 1.15 +/- 0.18 mmol/day) and incre
ased the N excreted in the soluble fraction by 280% (from 1.60 +/-0.30
to 6.08 +/- 1.16 mmol/day). These results show that the RH increased
the fecal N excretion and that this N is mainly in the soluble fractio
n.