Bioassay apparatus for rodent olfactory preferences under laboratory and field conditions

A bioassay apparatus is described which automatically registers frequency and the total time that rodents investigate sample odors. The apparatus provides free access for wild rodents, and its rugged weatherproof construction allows outdoor use for extended time periods. The photocell light source is covered by an infrared filter and it can be operated continuously or for preset time intervals. When the apparatus was utilized for rat sex attractant research, many of the odorants preferred by tame laboratory rats were also attractive to wild rodents under field conditions.