Abstract
Our recent studies1 have demonstrated the occurrence of spermatogenesis in the ovariotomized Leghorn fowl and explained the conditions under which it arises. In these cases ovariotomy was performed at a relatively early age before the primordial germ cells in the right rudimentary gonad were known to disappear. In a small percentage of the birds operated under these conditions spermatogenesis was later found to occur.These early cases of spermatogenesis were found on histological examination of the serially sectioned gonad. This study revealed that only exceedingly rarely did most of the gonad undergo spermatogenesis, but that almost invariably only a small part of the tubules of the gonad revealed this condition, while the rest of the gonad was composed of scattered sterile tubules varying in number. In a few cases spermatogenesis was apparently not yet complete in that no differentiated spermatozoa were found. A continuous passageway between the spermatic tubules and the associated vas deferens could no...
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