Hair loss and replacement cycles in socially housed, pregnant, rhesus macaques (2006)

Davis, E. B., Suomi, S. J.

Abstract

Our study investigated a group of socially housed rhesus macaques, housed in an indoor/outdoor run consisting of 2 males and approximately 10 to 13 breeding females. These animals were photographed at monthly intervals over a 3 year period (2003-2006). Photos were taken to assess hair coat condition, replacement intervals, and to assess if photoperiodism was the main driving force behind hair coat replacement intervals. To our surprise our photos illustrate a rigid hair loss/re-growth pattern that occurred only in our pregnant females. Hair loss was noted throughout the gestation period and re-growth occurred immediately after parturition. These loss and re-growth patterns did not correlate with any seasonal photoperiod episodes.