Burge, T., Panoussis, B., Weber, H. 1997. Primate housing facilities for pharmaceutical research in Switzerland (an example). Primate Report 49, 19-22.

According to the Swiss Animal Welfare Legislation, the minimal enclosure area for macaques of the size of rhesus or cynomolgus monkeys for experimental purposes is 15 cubic meters. In such an enclosure up to 5 adult animals may be kept with further 2 cubic meters for each additional animal. For experimental purposes the animals may be held in individual cages temporarily but should then have access to an enclosure of the above area. The housing system, developed on the basis of our experience, combines cages with an enclosure and enables pharmacologists to use monkeys over a period of years for repeated experiments and to keep them in small groups in the interim. The system posed only minor problems, chiefly related to group incompatibility with some animals when they reached sexual maturity.