The ability to determine the sex of an animal, especially poultry chicks, based on observable inherited characteristics visible at birth.
From 'auto-' (self) and 'sexing' (determining biological sex). Agricultural and breeding term developed in 20th-century poultry science.
Chicken breeders developed autosexing breeds where male and female chicks are visibly different at hatching—different colors, markings, or feather patterns. It saves farmers the labor of sorting thousands of chicks by feel or vent inspection.
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