Improper nutrition
Hens need a balanced and adequate diet to maintain egg production. Each egg contains significant amounts of protein and energy, which must first be consumed by the hen as part of its daily food intake. Too little dietary energy or an imbalance of amino acids can cause depressed egg production. Many backyard flock owners don’t realize how much calcium a hen needs. The shell of each egg contains roughly 2 grams of calcium.
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.
Occasionally, a feed mixing error causes important nutrients like salt to be left out of the diet. Insufficient dietary salt will depress egg production. Conversely, in some regions, well water may have too much dissolved sodium, which also will depress egg production. If water quality is suspected to be a problem, a water mineral analysis can be obtained through your county extension office, but be sure to contact the office for instructions before drawing the water sample.
Disease
Many poultry diseases will affect egg production. Often the birds will show symptoms of illness, but sometimes they will not. If a disease is suspected, it is important to consult a poultry veterinarian without delay. A timely diagnosis may allow effective treatment for some diseases. In the case of certain virulent diseases such as highly pathogenic Avian Influenza, a speedy diagnosis may prevent losses of whole flocks in entire regions, and minimize the risk of zoonotic transmission of deadly disease from chickens to humans, e.g., bird flu.
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