Auto-sexing
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Auto-sexing breeds of poultry are those in which the sex of newly-hatched chicks can be determined from the colour and markings of the down. Some breeds of chicken,[1]: 53 of goose and of domestic pigeon have this characteristic.[2] The idea of such a breed is due to Reginald Punnett, who created the first auto-sexing chicken breed, the Cambar, at the Genetical Institute in Cambridge in 1928.[3]: 318 [4]: 73