Pre-laying: Pre-laying refers to the period from the beginning of 21 weeks to the end of 28 weeks before the start of egg production until the egg production rate reaches 80%. A small number of breeder chickens were moved to 19-23 weeks of age at the time of production and peak egg production. The characteristic of this period is that the egg production rate grows rapidly, rising by 20%-30% per week. Chicken weight and egg weight are also increasing. The average body weight can still increase by 30-409 per week, and the egg weight increases by about 1.29 per week.
The peak period of egg production: When the chicken production rate rises to 80%, it enters the peak period of egg production. The egg production rate at the highest peak of 80% egg production rate still rises rapidly, usually rising to 92%-95% in 3-4 weeks. More than 90% of egg production can generally be maintained for 10-20 weeks, and then slowly decline. When the egg production rate drops below 80%, the peak period of egg production ends. The peak period of modern egg species can usually be maintained for about 6 months. The egg production rate remained at around 65% at 72 weeks.
Late egg production: From the weekly average egg production rate of less than 80% to the elimination of chickens, known as late egg production, usually refers to 60-72 weeks of age. The average egg production rate at the end of the egg production declines more than the peak period.
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