HUMANE TREATMENT OF ANIMALS USED IN RESEARCH 331 
registry of member hospitals. These hospitals meet the standards of the AAHA, 
standards which are comparable in many respects to those of the American 
Hospital Association. 
Comfortable housing for experimental animals requires physical facilities 
and methods of care which permit normal growth and development and the 
maintenance of animals in good health. The design of animal facilities to 
provide comfortable housing has been discussed in several recent publica- 
tions. 8 9 10 
ANIMAL HOUSING 
For conventional housing of most mammalian species, extremes of tempera- 
ture and humidity must be avoided and adequate draft-free ventilation and 
glare-free lighting is necessary. Generally, in indoor facilities, animal room 
temperature should be maintained between 72° and 80° F., and relative humidity 
should be 40 to 60 percent. Ten to fifteen complete air changes per hour (not 
recirculated) are desirable, and approximately 40 foot-candles of light should be 
provided. However, these general suggestions may vary considerably, depending 
on local requirements and specific use of the facilities. 
Anesthesia equipment for surgery involving research 
animals is similar to that used in hospital surgical 
suites. This piece of equipment is used at the 
Memorial Hospital of Long Beach. 
8 Thorp, W. T. S., "The Design of Animal Quarters,” J. Med. Educ. 35 : 4, 1960. 
® Barker, E. V., "Design and Construction of Animal Quarters for Medical Education and 
Research.” J. Med. Educ. 35 : 15, 1960. 
10 Thorp, W. T. S., “Space Requirements in the Design of Facilities for the Small Animal 
Species,” Washington, D.C. Federation of American Societies of Experimental Biology. 
In Press. 
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