Molting in avian species may be generally defined as
the periodic shedding and replacement of feathers. For
most wild species of birds, molting involves reproductive
quiescence. The domestic hen likewise experiences a decrease
in reproductive function during a naturally occurring
molt. However, this reproductive quiescence has
been found to be incomplete, and the hen often continues
to lay eggs at a low rate for a prolonged period. Therefore,
for the commercial egg producer, there would be a period
of unprofitably low egg production signifying the end of
the useful life of a flock. To avoid this, most hens are sold
and replaced just prior to the onset of natural molting.