Abstract
In the experiment reported here, the lactulose/rhamnose urinary excretion test was used to compare intestinal permeability between four breeds of healthy adult dogs and a group of healthy adult cats. A significant difference in permeability was found between dogs and cats (P<0·001) and between different breeds of dogs (P<0·005). The range of urinary lactulose/rhamnose ratios in the dogs in this study (0·07–0·61) was wider than previously reported (0·03–0·12). The mean value for dogs was 0·19. The range in cats was 0·41–1·25 and the mean 0·52. The results of this study suggest that breed or some other factor such as environment, diet or sexual status as well as species should be taken into account when assessing intestinal permeability using the lactulose/rhamnose urinary excretion test.
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