First, do a good job of cleaning and disinfection before hatching.
There are 100-300 bacteria on the shell of the freshly-produced duck eggs, which will reach 5000-6000 after 1 hour. Especially in the high-temperature season, the bacteria will multiply quickly and easily enter the eggs through the pores on the eggshell, causing pollution. If no disinfection is bound to affect incubation. Disinfection method can be selected 0~02% potassium permanganate or 5% benzalkonium bromide solution, prepare and wash the eggs with warm water of about 40°C, after drying, enter the incubation, the disinfectant should be replaced frequently, and the current disinfectant can be used now, also can choose to use Forma Forest fumigation disinfection, formalin 28 ml per cubic meter, 14 grams of potassium permanganate, fumigation for 20 minutes, and then open the doors and windows as soon as possible to eliminate the gas.
Second, timely incubation or reasonable preservation of eggs.
The average temperature in the southern area from June to September is above 27°C. When the temperature is higher than 23 to 9°C, the egg embryo will develop slowly and even die of aging. Eggs that cannot be hatched in time should be stored in the egg storage room, equipped with automatic temperature, humidity, ventilation, and egg turning devices. Storage temperature is 10-15 °C.
Third, reduce the internal temperature properly.
Generally 0-3 days embryo 37-8°C, 4-7 days embryo 37-5°C, 8-14 days embryo 37-6°C, 15-20 days embryo 37-5°C, 21-25 days embryo 37?2°C. 26 days of embryo growth on the bed.
Fourth, increase the number of cool eggs and water spray and time.
The water was sprayed once a day from the 8th day of embryonic development and sprayed twice a day from 12 days of germination. Water was sprayed three times daily from the 16th day of embryonic development until hatching. After 5 days of embryonic day, cool eggs are delivered once every morning and evening, about 20-25 minutes each time, so that the eggshell temperature drops to about 32°C, and then the hatching is started.
Fifth, prevent over-temperature incubation.
Since most of the hatcheries currently do not have air conditioners installed, the room temperature often exceeds 30°C in the high temperature season. Therefore, after the embryos of the hatching eggs have reached 16-17 days of embryonic age, the embryos themselves generate heat and are easily overheated, even if the heating devices in the hatchery are long-term. In the heat-dissipation and vent holes all open, still can not fully discharge the metabolic heat of embryonic development, in this case should be opened before and after the door a treaty a few centimeters of the gap in order to accelerate the heat, so as to prevent overheating.
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