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Hens' sperm ejection secrets

Uploader: Vudotilar 3 years ago  
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Studies have shown that dominance has a genetic component: Birkhead All Rights Reserved. Since lower-status roosters don't get the first shot at the hens, for this reason alone, their sperm are more likely to be ejected, Pizzari explained. Winstead June 16, Using chickens from a flock that lived in a semi-feral setting, similar to their wild ancestors, the red jungle fowl, Pizzari and other scientists led by Rebecca Dean who conducted the study while at Oxford and is now at University of Uppsala in Sweden mated hens with various roosters; the scientists ranked roosters' social status from 1 to 6, with 1 being the most dominant.

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