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Sexes of chukar partridges (Alectoris chukar), and other species of partridge, are difficult to distinguish because the sexes often have similar plumage. A method for determining the sex of day-old chukars was described by Siopes and Wilson (1973) based on a modified vent-sexing technique commonly used for domestic poultry (Komatsu 1935).

According to Siopes and Wilson, sex determination is based on the shape of genital protuberance (Fig. 16-4). In males, the protuberance is large and either cone or heart shaped. In females, the protuberance is absent or is small and flat.

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