The age at which hens start laying eggs varies from species to species, about five months. After the start of production, egg production is generally high in the first year, except for a few eggs. Since the second year, egg production has gradually decreased. Since the first year egg production of aircraft type eggs was calculated as 100%, the egg production in the second, third, fourth and fifth year respectively decreased to 84% 72%, 63% and 55%. Therefore, keeping old chickens in the group is not eliminated, which is detrimental to production. In modern commercial chicken farms, hens are generally eliminated after laying eggs for twelve to fourteen months. By adopting the “all-in, all-out†approach, chicken farms can often maintain high production levels. Feeding management and epidemic prevention. The commercial egg produced by this chicken farm is not used for breeding, and it is not necessary to raise a rooster. In breeder farms, in order to reduce the cost of brooding, when the hen is nearing the end of the first year of egg production, forced moulting can be performed for a period of time. The breeder breeder's age ratio is generally 55% a year, 33% in two years, and 12% in three years. The roosters have the strongest vigor in the first year. They usually use only one year. After the breeding season, they should be eliminated immediately to avoid wasting feed. The breeder's excellent rooster can sometimes be used for two years. As for broiler breeder chickens, the egg production declines more in the second year, and the chicken body weight is often too large, which is not conducive to egg production and breeding. Generally, the use of the first biological egg production year is eliminated after 64 to 68 weeks of age.
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