How to hatch chicks?

Five conditions for hatching:

(1) temperature: temperature is an important condition for embryonic development. The embryo can still develop at a temperature of 32-40 degrees. Shi Wen wants to be high in the front, flat in the middle and low in the back. The temperature was 38-38.5 degrees in the early stage, 38-38.5 degrees in the 8-14 days, 37.5-38 degrees in the 15-21 days, 37-37.5 degrees in the later stage. If more than one batch of breeding eggs are hatched in the machine, the constant temperature of 37.8 degrees for 15-21 days can be used for the later stage, and the temperature of 37 degrees can be used for 37.5 degrees. If multiple batches of eggs are hatched at the same time, the constant temperature can be 37.8 degrees. The temperature can be raised appropriately at 21 days to facilitate the smooth hatching of the chicken. The effect of ① high temperature on embryo development: high temperature shortens the incubation period and increases the mortality. Embryos die in 3 hours at 42 degrees market: effects of ② low temperature on embryo development: low temperature can prolong incubation period and increase mortality. In the low temperature below 36 degrees Celsius, after more than one day, it will cause embryonic hypoplasia and die in the shell before coming out of the shell.

(2) humidity: the development of embryo adapts to humidity in a wide range. Generally, it is between 50% and 70%, 1-7 days is the Prophase, and the relative humidity should be 60%. 8-17 days is the middle stage, the relative humidity should be 50%, in the 18-21 days is the later stage, the relative humidity is 70%. This is because amniotic fluid is generated in the early stage and urine is excreted in the middle stage, which is conducive to the emergence of the shell in the later stage. The effect of high humidity of ① on embryonic development: affecting the distribution of allantoic night, resulting in long hair, big belly, bulky and dull, and low humidity of ② on embryonic development: excessive evaporation of water in eggs, resulting in short hair of chicks.

(3) ventilation: good ventilation conditions can provide sufficient oxygen to the embryo and discharge carbon dioxide at the same time to ensure the gas metabolism and physiological function of the embryo. If there is poor ventilation, there will be abnormal fetal position and malformed embryos. Even death. In the early stage of incubation, there is less oxygen due to low material metabolism, while in the later stage, the metabolism is exuberant and oxygen is more. After 19 days, the embryo began to breathe through the lungs, raising more. When there is a contradiction between thermal insulation and ventilation in ①, thermal insulation should be satisfied first and ventilation should be considered. ② protects against carbon dioxide poisoning; the proportion of sulfur dioxide is smaller than air, so he leaves a small hole in the top of the hatchery to prevent poisoning.

(4) turning eggs: the main function of turning eggs is to prevent the embryo from adhering to the egg membrane. Egg yolks are lighter than egg whites and embryos are lighter than egg yolks. The embryo is often in contact with the egg membrane, and the position of the egg is changed when turning the egg, and the contact point between the embryo and the egg membrane is also changed. therefore, the adhesion between the embryo and the egg membrane is avoided. Turn the eggs: turn the eggs every hour and a half. There is no need to turn the eggs after 17 days, and the eggs are moved to the nestling area.

(5) Cold eggs: the main function of cold eggs is to distribute the excess physiological hot river in the eggs to provide sufficient oxygen to the embryos, so as to prevent the occurrence of overtemperature accidents and embryo suffocation due to hypoxia. There is no need to cool eggs for one to seven days, once a day for eight to twelve days, for 15 minutes each time. Cool twice a day for thirteen to seventeen days, twenty minutes each time. Cool every four to six hours from eighteen to 21 days, fifteen to twenty minutes at a time. The method of cooling eggs: open the front door and turn it once in the middle of the cold eggs, and the cold eggs can also be combined with the dial.