Strain Difference in Coprophagous Behavior in Laboratory Mice(Mus musculus)
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Coprophagous behavior was observed for a period of 24 hr in two strains of mice (Mus musculus), ICR and C3H/He, in a semibarrier-sustained room illuminated for 14 hr a day (lights on at 0500 and off at 1900). The results were compared with those of the IVCS strain (derived from the dd strain). Animals of each strain practiced coprophagy frequently for about 8 hr after the lights were turned on. The number of fecal pellets ingested was 6.2±0.6 (mean±standard error) in ICR males, 5.3±0.8 in ICR females, 1.7±0.4 in C3H/He males, 1.0±0.4 in IVCS males, and 3.3±0.5 in IVCS females (data on the IVCS strain were quoted from a report by Takahashi et al, Zool. Mag., 92: 397-401, 1983); there were significant differences among the strains and between the sexes in IVCS mice. Animals displayed two types of coprophagous behavior. In almost all cases, animals ingested feces by taking them directly from their anus, and in rare cases, from the wire-mesh floor. Coprophagous behavior was frequently observed during the time of day when feeding and drinking activity was lower. That is, the behavior of coprophagy was not synchronized with that of feeding and drinking.
- Zoological Science
Zoological Science 2(2), p249-255, 1985-04
Zoological Society of Japan