Chickens have a pineal gland (a gland behind their eye) which functions to control reproduction. Increasing day length in the spring acts to naturally stimulate egg production through the increased length of exposure to light. Furthermore, as the amount of light decreases in the fall and winter due to shorter day length, egg production naturally declines.
The use of artificial light to supplement natural daylight allows egg production to continue throughout the year. To maximize egg production in the hen, Purina Mills’ researchers recommend 14-17 hours of light per day. Providing supplemental lighting in the spring, fall and winter will insure that the number of hours of light remains consistent thereby allowing optimum egg production throughout the year.