1, good pre-incubation cleaning and disinfection work.
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 use 002% potassium permanganate or 5% benzalkonium bromide solution, with about 40 °C warm water preparation washing eggs, after hatching, hatching, disinfectant should be frequently replaced, with the current use, can also use formalin fumigation Disinfection, use 28 ml of formalin per square meter, 14 g of potassium permanganate, fumigation for 20 minutes, then open the doors and windows, remove the gas as soon as possible.
2. Incubate in time or properly preserve eggs.
The average temperature in the southern area from June to September is above 27°C. When the temperature is higher than 239°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.
3, reduce the internal temperature properly.
Generally 0-3 days embryonic 378 °C, 4-7 days embryonic 375 °C, 8-14 days embryonic 376 °C, 15-20 days embryo 375 °C, 21-25 days embryo 372 °C. 26 days of embryo growth on the bed.
4, properly 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.
5, prevent excessive 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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