Abstract
To obtain fundamental data on the endocrine background for the wild Japanese macaque (Macaca fuscata) growth profiles, we have measured plasma insulin-like growth factor 1 (IGF-1) concentrations of free-ranging and open-enclosed Japanese macaques from five different regions in their habitat. General features of the IGF-1 levels in those troops were: 1) an age-dependent increase in the young macaques and 2) distinctively higher values among several adult females. The age changes in IGF-1 levels during the adolescent period in the free-ranging Japanese macaques were similar to those in the caged Japanese macaques.
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