For other species cages should be measured and the animals weighed to determine if requirements are being met. The ultimate measure of whether or not cage space is adequate is the condition of the animal. If animal waste is excessive, or if significant aggression is occurring, the cage is too crowded. Type of Caging Grate type floors are generally used for large animals and rabbits for sanitary reasons. Solid floors may be necessary if the grate causes foot or leg problems.
Solid bottom caging with bedding is the preferred type of caging for all rodents.
Animals over 600 g must have this type, unless a grate is necessary for scientific reasons. Breeding animals must have a solid floor at least in a nest box, bedding and additional nesting material. Immunodeficient animals, or animals to be maintained specific-pathogen free or gnotobiotic may require housing that has been sterilized, usually by autoclaving. Some animals may require housing in filter top caging to prevent transmission of diseases into or out of the cage. These cages must be handled in protective hoods using sterilants for anything that will touch the interior of the cage.