Abstract
tion 1949-1953. Eight age determination methods were tested in an effort to determine which method would be most accurate and usable in Michigan (Table 2). The pelt primeness pattern provided accurate age data. The method also has great utility as it is possible to examine a trapper's season catch, or large numbers of pelts at fur houses without the necessity of making daily contacts. If it is desirable to examine muskrats before skinning, the external sex characteristics should prove most reliable as age indicators. Internal age determination by testes and uteri, although accurate, are time-consuming. It is also necessary to examine the carcass soon after skinning.
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