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When a hen is broody (incubating eggs or raising chicks) her hormones "switch gears" and that means that production of eggs is disrupted. Once she finishes her broody cycle the hormones will transition back to production mode. This process can vary considerably from one hen to the next as far as how long it might take. Some factors that can influence the return of production are age of the hen, time of year, how long she "mothers" the chicks, diet, overall health of the bird, etc.