Abstract
WHETHER the size of comb is employed as a quantitative measure of the activity of androgenic hormone, or as an indicator of breeding capacity, its use for such purposes depends upon an accurate estima′tion of comb si2;e. As early as 1932 Koch pointed out that ‘at present writing, units used by different laboratories cannot be interpreted in terms of each other. There are so many factors involved in comb growth response and in accurate measurement thereof that considerable investigative work should be done before we attempt to adopt an international standard.’ However, no adequate study has been reported which evaluates the different types of measurements of comb size that are commonly used. The comb of the fowl has been employed by many investigators as an organ with which to assay the potency of androgenic hormones. In studies of reproduction, Blyth (1928) found the comb to be an indicator of the onset of spermatogenesis in young males.
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