Genetically modified chickens reveal testosterone's complex role in both male and female birds

PHYSorg
Oct 22, 2024, 12:13 pm61 pts
Why does the rooster crow and the hen does not? This question prompted the scientist Arnold Adolph Berthold to castrate a rooster in the mid-19th century. The result of his experiment: the rooster's morning crow was over. At the time, Berthold did not know which substance in the rooster's testicles might be…

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