Abstract
Patterns of body fat deposition and reliability of fat indices in wild Japanese monkeys (Macaca fuscata) were examined using 50 (22 females and 28 males) adult (≥5 years of age) specimens. The body fat reserve (%), which was calculated as [amount of whole visible body fat]/[carcass body weight]×100, is highly correlated with subcutaneous fat and mesentery (including omentum) fat. Body fat reserve was estimated as 302×(mesentery fat/body weight)-0.62. Body fat reserve exhibits a significant seasonality in both sexes.