Increased cage size does not alter heart rate or behavior in female rhesus monkeys (1990)

Line, S. W., Morgan, K. N., Markowitz, H. et al.

Abstract

The behavioral and heart rate responses of 10 female rhesus monekys to three different-sized, barren cages were measured. No differences were found and the conclusion drawn that the proposed [by USDA, 1985] changes in cage size will not improve well-being in any measurable ways.