my country is the world's largest laying hen farming country, with an annual inventory of about 1.5 billion laying hens. In order to make the egg supply system better adapt to changes in the market demand structure and meet the diversified needs of the market, it has the characteristics of small size, high egg production, low consumption, good egg quality, and strong stress resistance. It has been increasing year by year. According to the characteristics of food-saving laying hens, the key technologies for large-scale breeding of food-saving laying hens during brooding period are summarized as follows:

1 Feeding technology and breeding equipment
1.1 The scale of feeding process The laying hen farm generally adopts a two-stage or three-stage full cage feeding process. The two-stage breeding process is to divide the laying hens into two stages: brooding (hull out ~ 15 weeks of age ) and laying (16 weeks of age ~ eliminated). It has the advantage of reducing one flock transfer and reducing the stress and labor of the flock. However, because the laying hens are brooded in the same house, there is a large space for heat preservation in the early stage and high temperature requirements. The flock can maintain self-heating in the later stage, resulting in heating. The equipment is idle; the three-stage breeding process means that the laying hens are divided into three stages: brooding (hulling ~ 6 weeks of age), rearing (7 ~ 15 weeks of age) and laying (16 weeks of age ~ elimination). The advantage is that the utilization rate of the chicken house and equipment is high, which is easy to manage , but one more transfer will increase the workload and the flock will be stressed. At present, large-scale layer farms in Jiangsu Province mainly adopt two-stage breeding techniques.

1.2 Breeding equipment Breeding equipment mainly includes brooding cages, vacuum drinking cups or shallow water trays, nipple drinkers, pans, troughs, feeders and other feeding equipment, fans, wet curtains, lamps, intelligent control cabinets and other environmental control equipment , Hot air stoves , boilers, electric heating tubes and infrared lamps and other heating equipment, manure collection conveyor belts, manure scrapers, manure conveying belts or screw augers and other manure removal equipment. At present, the large-scale breeding of brooding chickens adopts the "all- in, all-out" cage mode [1]. The brooding chicken cages have 4-layer A-type cages and 4-layer H-type cages, all of which use nipple automatic drinking water and driving mechanical feeding. A type cage adopts manure collecting trough + scraper to collect manure or conveyor belt to collect manure, H type cage uses conveyor belt to collect manure; heating methods mainly include coal stove pipe heating and hot air sto ve air bag heating , Natural gas boiler hot water and hot gas pipes and radiating fins for heating, electric heating tubes and infrared lamps for direct heating. Because the natural gas boiler hot water and hot gas pipeline and radiator provide temperature, the temperature in the house is stable and uniform, clean and hygienic and safe, and easy to operate and manage. It is currently the main heating method for large-scale brooding and laying hens, but the one-time investment is relatively large.
2 Preparations before entering the chicks and selection of young chickens
2.1 Preparation before entering the chicks (1) 2 to 3 weeks before entering the disinfection of the chicks, check, maintain and repair the brooding house and breeding equipment and utensils. Focus on checking whether the roof, walls, doors and windows, and ceiling of the chicken house are intact to ensure the heat preservation effect of the chicken house and no "stealing wind"; focus on repairing and maintaining the circuit, feeder, fan, lamps and other feeding, ventilation and lighting systems, and drinking water Drinking water system, heating system, manure collection (cleaning) system, and cage equipment to ensure the normal and stable operation of the equipment.

(2) Clean up, sweep, clean and disinfect the brooding house. The specific procedures are: cleaning (cleaning out debris, trays, drinking fountains and other utensils) → spraying disinfectant → cleaning (floor, wall, hanging hall) → cleaning ( washing cages, floors and walls with high-pressure water gun water) → drying 1~2 d→first spray disinfection (2%~3% caustic soda spray disinfection on the floor and walls, and 1:1000 dilution spray disinfection of the cage and space)→Clean water after 2~3 d of action Rinse→dry for 2~3 d→second fumigation disinfection (fumigation disinfection with 40 ml/m3 formaldehyde + 20 g potassium permanganate, or space fumigation disinfection with 3 g/m3 peroxyacetic acid)→after fumigation for 1~2 d , Open the doors and windows or start the fan to discharge the disinfectant → the third disinfection 1 d before entering the ch