1. Turning eggs: From the 1st day of hatching of duck eggs to the hatching of ducklings, it is possible to turn eggs 6-8 times a day or night. Turning the egg can change the position of the embryo, promote the movement of the embryo, heat evenly, and prevent the adhesion of the embryo to the eggshell. When it is found that the temperature is high and the temperature difference between the upper and lower layers, the center and the edge is large, the egg is immediately turned, the position is changed, and the temperature is adjusted. On the 26th day, the egg is erected to facilitate the ducklings to break the shell. Fire eggs hatching turn eggs by hand, must be careful to minimize the rate of damage.
2. Egg inspection: Eggs were hatched on the 5th, 13th and 24th days of human incubation. Looking through the lights or sunlight, pick out lean and dead eggs. It is also possible to distinguish dead eggs from egg temperature and egg color. Hands feel cold or the tip of the egg is dark and dead embryos can be handed out.
3. Ventilation: The incubator should be ventilated and ventilated to ensure that the embryos often breathe fresh air and improve hatching rates.
4. Cool egg: The purpose is to help the embryo to cool and breathe fresh air. Duck eggs contain more fat, and the calories generated with the development of the embryo increase. If the temperature is improper, it will easily lead to death. On the 7th to the 15th day, cool eggs were used 3 to 5 times/day; on the 15th to 20th days, 5~7 times/day; on the 20th to 27th days, 10 times/day. Each time 15 to 20 minutes, you can also cool eggs once every morning and evening to reduce the egg temperature to 32°C to 34°C and return to normal temperature after about 1 hour.
5. Water spray: The hatchery practice is to spray water from duck eggs on the 7th day, spray 2~6 times a day, spray every 2 hours on 24th to 25th days, and on the 26th to 27th days. Sprayed once, on the 7th to the 22nd day, the spray was finely sprayed, and on the 23rd to the 27th, it was drip-like, making the water drop evenly on the egg surface. When the egg temperature is high, you cannot spray water immediately. The usual spray temperature is 40°C, and it is advisable to maintain the normal temperature after spraying. After egg surface moisture evaporates, it is covered again.
6. Shelling: Normal hatching starts on the 26th day and the shell is broken until the 28th day. At this time, the hairy ducklings and egg shells should be removed every 2 to 3 hours.
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