In order to increase the egg production of hens, some chicken farmers randomly increase the amount of vitamins they supply. As a result, hypertrophy occurs in laying hens, which in turn affects the growth and production of laying hens. Addition of vitamins to layer chicken diets must be strictly adhered to standards, and arbitrarily increasing dosages can cause harm to laying hens.

The appropriate amount of vitamin A per kilogram of feed for laying hens is 4,000 international units. When the feeding amount exceeds the feeding standard, it can cause hen vitamin A excess syndrome, manifested as mental depression or convulsions, feed intake decreased, serious eating, feathers fall off.

The appropriate vitamin D content per gram of feed for laying hens is 500 IU. When the feeding amount exceeds the feeding standard, a large amount of calcium can be transferred out of the bone tissue of the laying chicken and promote the absorption of calcium in the gastrointestinal tract, so that the blood calcium concentration is increased, and calcium is deposited on the arterial wall, joints, renal tubules, and heart And other soft tissues, the clinical manifestations of loss of appetite, diarrhea, kidney stones, laying hens often die of uremia.

The optimum content of vitamin E per kilogram of feed for laying hens is 5 IU. Overfeeding can lead to impaired fat metabolism in laying hens, leading to fatal or poisoned deaths.

The optimum content of vitamin K per kilogram diet is 0.5 mg. When fed excessively, because it stimulates inflammation of the gastrointestinal mucosa, the chicken shows a sharp decrease in appetite and diarrhea, resulting in a decrease in egg production and severely discontinue production.

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