The sex-change chicken has baffled scientists at the UN's Farm and Agriculture Organization, who are now planning to study Gianni's DNA to see what made him change.
An expert at the center said: 'It may be a primitive species survival gene. With all the females gone he could only ensure the future of his line by becoming female.'
Professor Donato Matassino, who will be leading tests on Gianni, said: 'This rooster-hen will be taken to the laboratories of Consdabi (Consortium for the experimentation and application of innovative biotechniques) for a series of behavioral and genetic tests.
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