Abstract
The early embryonic gonadal development in the cattle is characterized by the appearance of an alkaline phosphatase positive blastema. Its derivatives in gonads of both sexes, follicular cells in the female and interstitial cells in the male, also show positive alkaline phosphatase reaction. Primordial germ cells are equally alkaline phosphatase positive, but loose this activity when they later transform to oogonia and oocytes, or to spermatogonia respectively. Using the enzyme activity as label to trace these constituents in the developmental steps of the bovine gonads, the following results were obtained.
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