Volatile compounds from excreta of laboratory mice (Mus musculus)

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Abstract
Volatile components of all the excretory products deposited by house mice may contribute to their ability to identify their own territories. When mice were placed on a clean surface, they deposited feces, secretions discharged from the anus (anal secretion) and urine. Exposure to several clean surfaces in succession caused a decline in the number of fecal pellets and urine spots deposited and an increase in the number of anal smears. The volatile compounds emanating from feces and anal secretion appeared to be qualitatively and quantitatively different from those emanating from urine, but many compounds with short retention times appeared to be common to feces and anal secretion. Introducing volatiles from feces of strange males into the territory of a singly housed male altered the site at which the resident animal deposited its feces but had no effect on the site at which it urinated. Introducing the feces or the anal secretion of a male mouse into the environment where it encountered a strange conspecific appeared to improve its success in encounters with a conspecific. It was concluded that at least some of the volatile compounds that enable mice to distinguish their own territory from those of neighboring groups may be derived from feces and that many fecal volatiles may originate from the secretions of glands opening into the digestive tract.