Special feeding and management will have special effects in laying hen production. The following are some special feeding methods abroad:
Adding vitamin C: The results of the Russian study showed that the laying hens were fed with 40 mg of vitamin C per kilogram, which increased the yield of eggs by about 6% in 3 months; 30% per kg of feed at 17 ° C to 27 ° C. Mg of vitamin C increased egg yield by 7% in 48 weeks.
Adding choline: The results of adding choline to laying hens for 44 weeks in the United States showed that the laying rate of laying hens fed with 0.05% choline was 76.2%, the average egg weight was 61.5 grams, and the average final body weight was 1943 g; no choline was added. The laying rate of laying hens is 73.3%, the average egg weight is 58.7 grams, and the final weight is only 1906 grams.
Adding tryptophan: Japanese experts added 500ppm L-tryptophan to the basic diet of laying hens, the egg production rate increased by 9%, the daily egg production increased by 5.5 grams, and the egg production rate after 53 weeks of age. There is still improvement.
Head cooling method: Install a ventilation pipe on the top of each house to supply cold air. As long as the head of the hen is kept cool and the temperature of the hen's head is lowered, the laying rate of the hen can be increased by about 25%.
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