Special feeding and management will produce special effects in layer chicken production. The following are several special feeding methods abroad: 1. Vitamin C is added. The results of the Russian study showed that chicken hens were fed diets containing 40 mg of vitamin C per kilogram at a temperature of 17.8-44.4°C, producing about 6% of eggs in 3 months; at 17-27°C At temperature, 30 mg of vitamin C was added per kg of feed and 7% of eggs were produced within 48 weeks. Second, add choline. The United States added choline to laying hens for 44 weeks. The results showed that the egg laying rate of 0.05% choline fed laying hens was 76.2%, the average egg weight was 61.5 g, and the average final body weight was 1943 g; Alkaline laying hens produced 73.3% eggs, average egg weight 58.7 grams, and final weight 1906 grams. Third, add tryptophan. Japanese experts added 500ppm of L-tryptophan to the basal diet of laying hens, and the egg production rate increased by 9%, and the egg production rate after 53 weeks of age still increased. Fourth, hunger law. The hens are hungry one month before they enter the laying period, and gradually reduce the amount of feed in the first week. After one week, the amount of feed is controlled at 1/20 of the normal amount, mainly drinking water, which makes the hens highly hungry. . After one month of hungry feeding, the amount of feed was gradually added to the normal amount, and after the normal amount was restored, it entered the laying period. As the hen's vegetative growth is inhibited during the hunger phase, it promotes reproductive development and estrogen secretion, which can increase egg production by about 40%. Fifth, head cooling method. A ventilation duct is installed on the top of each house to supply cold air, so long as the head of the hen is kept cool, and the temperature of the head of the hen is reduced, the laying rate of the hens can be increased by about 25%.
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