The age of maturity of female birds will differ between species of birds. The maturity refers to the age at which the females reach sexual maturity and will start laying eggs and breeding with their male partners.
Quail = about 50 days old (I have observed that female Japanese quail will start to lay eggs from about 6-8 weeks old.)
Hen = about 6-8 months old.
Partridges = female grey partridges mature from about 10-12 months old.
Pheasants = about 6-7 months old.
Guinea fowl = about 8-10 months old, however female guinea fowl can start to lay as early as from 16 weeks old.
Ducks = about 4 months old, generally domestic ducks will start to lay from 21 to 26 weeks of age. My khaki campbell ducks started to lay from about 20 weeks old.
Turkeys = about 7 months old.
Geese = about 7 months old.
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