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Declining day length
Hens are sensitive to day length, and particularly to the direction in which day length is changing, when it comes to laying eggs. Declining day lengths discourage egg production. It is not unusual for a flock owner to have hens go out of production in the latter part of summer and in the fall because the days are getting shorter. Commercial egg producers avoid this problem and maintain egg production year round by using artificial lighting to give hens a long day length no matter what the season.
Improper nutrition
Since the skeleton of a typical modern egg-laying breed of hen only contains about 20 grams of calcium, each egg represents 10% of the hen’s total bodily calcium. While the hen’s skeleton acts as a calcium reserve to supply the demands of egg production, this reserve is rapidly depleted in the absence of an abundant calcium source in the feed eaten by the bird. In such a situation the hen will stop laying eggs. To maintain egg production, flock owners should feed only a prepared layer ration balanced to meet a hen’s nutritional requirements, or at least provide a particulate source of calcium, e.g. suitably sized ground limestone or oyster shell, that the birds can eat selectively according to their needs. The layer ration or calcium source should be available from a local feed supply store.
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