1 egg selection
Eggs should be fresh, color is better, in line with the requirements of not white skin, soft skin, not trachoma, its egg weight is generally 9 ~ 12 g or more, egg shape should be a slightly pointed, slightly rounded, egg diameter and diameter Better than 1:1.4.
2 eggs preserved
The egg storage room shall be air circulated, there shall be no mosquitoes or flies in the room, and there shall be no rodent damage. The concentration of harmful gases in the room shall be below the prescribed hygienic standard. Eggs should not be shaken, and cold air should be blown and direct sun should be prevented. Egg preservation time: summer 7~8 d, winter can not exceed about 10 d.
3 kinds of egg disinfection
Eggs should be disinfected before hatching. Eggs can be placed in egg trays (eggs standing upright or slightly inclined, big heads facing upwards) and then placed on an egg rack and pushed into the incubator for disinfection. The fumigation method can be used for disinfection. The dosage of formalin is 28 mL per square meter, and the fumigation time is 20 minutes.
4 temperature control
The incubation temperature is relatively stable at 37.8 to 39 °C. The incubation temperature can be appropriately adjusted due to different age, species and seasons. Under normal circumstances, the smaller the embryonic age, the higher the incubation temperature is. With the increase of the embryonic age, the incubation temperature can be appropriately reduced. The egg-type cultivar requires the incubation temperature to be low, and the dual-use cultivar is required to have the higher temperature. It is required that the incubation temperature be slightly higher and then gradually increase with the temperature, and the incubation temperature can be appropriately reduced. The temperature in the incubation chamber should be kept at 20~25 °C.
5 Humidity control
Humidity generally refers to the relative humidity in the hatchery. Humidity should be adjusted according to different stages of embryonic development. At the beginning of incubation, the humidity should be maintained at 55% to 60%. In the medium term, for cyst fluid and amniotic fluid, the relative humidity should be reduced to 50% to 55%. To prevent fluff from sticking to the eggshell, the relative humidity should be increased to 65% to 70%. Humidity is mainly regulated by increasing or decreasing the area of ​​the water tray in the incubator and controlling the amount of water in the hatchery.
6 Ventilation
During the incubation process, the vent holes on the incubator should be opened gradually as the age of the embryo grows. The air exchange was performed 1 or 2 times a day 8 days before hatching, and the number of air changes was appropriately increased after 8 days. In case of hatching in the incubator, the vents should be fully opened to allow the chicks to breathe.
7 Flip eggs
The hatching position and angle of the hatching eggs are mainly to make the eggs heated evenly, promote embryo activity and prevent the adhesion of embryos and egg shells. During hatching, the egg should be turned once every 2 hours. The angle of turning the egg is 60. Turn the egg 2 to 3 days before hatching.
8 Egg inspection
Eggs are generally tested twice during hatching and the development of the embryos can be determined by examining the eggs. The first photo can be used after 4 to 5 days after hatching to check the egg with an egg test lamp. The color of the fertilized egg is red, and the embryonic blood vessels are seen to be spider-like. The central eye has dark eyes, and the unfertilized egg is light-transmissive. Similar to eggshell color. The second illumination should be carried out 10 to 13 days after hatching. At this time, the eggs that have stopped developing should be removed to avoid stinking and contaminate the air in the incubator.
9 Make sure to hatch
The eggs can be hatched after 16 to 17 days after hatching. If the hatching temperature is relatively uniform, the hatching can generally be completed within 2 to 3 hours. In the incubator, due to different incubation levels and uneven temperatures, the hatching time should be extended for a day and night. After hatching the feathers, the young chicks can be put into a preheated brooding box for nursing. Hard to hatch hatchlings can be hatched artificially.
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