The laying hens enter the due date from the age of 16 weeks and reach the peak of egg production at the age of 25 weeks. Whether the feeding and management level in this period meets the requirements of the chicken's growth and production and egg production, has a great influence on the egg production during the entire laying period. .

First, the characteristics of physiological changes

1. The broiler chicken enters the laying cycle from about 18 weeks of age, the body weight rapidly increases, and the reproductive system develops rapidly. The follicles on the ovary grow rapidly in large numbers, and the fallopian tubes also quickly grow thicker and longer and increase in weight. Weight gain and reproductive system maturation occur simultaneously. At this time, some chickens started to lay eggs. The egg production rate of well-developed chickens reached 5% at 20 weeks of age, 50% at 22 weeks of age, and 80% at 24 weeks of age. Therefore, the various nutrients in feed for chickens during this period Both environmental conditions and external conditions are very strict.

2. After the laying hens enter the pre-production period, great physiological changes have taken place in the chicken's body. Whether physically or mentally, they are in a state of physiological stress, coupled with the effects of colony, immunity, and deworming, and body resistance. Obviously decreased force, prone to various diseases.

Second, feeding and management measures

1. Transit groups timely, inoculate and deworm on time. It is best to work with laying hens before 18 weeks of age in order to make the hens familiar with the environment as soon as possible. Too late to make part of the chicken has been discontinued production, or make the yolk fall into the abdominal cavity caused by yolk peritonitis. In addition to cages or cages, Newcastle disease oil seedlings plus live vaccines, inactivated egg drop syndrome vaccines and other vaccines should be inoculated. After entering the cage, it is best to conduct a thorough deworming work, and spray the medicine on the surface parasites such as cockroaches and cockroaches. The endoparasite may be administered with albinoimidazole 20-30 mg/kg body weight, or may be taken with afudin (Insect Buster) infusion. Trans-group, before and after inoculation should add a variety of vitamins, antibiotics to reduce stress response.

2 timely conversion of egg production. In order to adapt to the increase of body weight, reproductive system growth and calcium demand, layer feeds can be started at the age of 18 weeks, and the peak feeds can be fed from the age of 20 weeks. At the same time, an additional amount of multiple vitamins is added to the material. During this period, the method of restricting feeding should be cancelled so that chickens can freely feed. Make sure there is always material in the tank during lamp turn-on.

3. Increase the lighting time. Farmers in rural areas adopt natural lighting methods during the breeding period. At the age of 18 weeks, if the chicken population reaches the standard, the light may be increased for 30 minutes every two weeks until the total number of light reaches 15 or 16 hours per day. If the chicken population is lighter and develops more slowly, it may be postponed to 20 weeks of age to increase the illumination time while increasing the feed. The principle of lighting during the production of eggs is that the time cannot be shortened and the intensity cannot be reduced.

4. Create a comfortable environment for chickens. The most suitable temperature for laying hens is 13°C～23°C. In winter, it is better to keep above 10°C. In summer, it is better to keep below 30°C. It is necessary to maintain indoor air circulation, prevent various noises, and maintain the stability of the environment and feeding, drinking water, and light.

5. Do a good job of prevention and control of epidemics. (1) Antibiotics such as norfloxacin, ciprofloxacin, gentamycin, etc. are added to the feed or drinking water after the laying hen enters the cage. They are administered every 4 to 5 weeks for the prevention of E. coli, salmonellosis, and enteritis. Wait. (2) Regularly adding multiple vitamins to the feed in order to adapt to the chicken's egg production needs and reduce various stress responses, and increase resistance to various diseases. (3) Strengthen health management, implement reasonable immunization procedures, adhere to the chicken disinfection and environmental disinfection system, and prevent the introduction of the disease. Pay close attention to whether the rising rate of egg production complies with the standards and pay close attention to any minor effects of the external environment on the flock.

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