The incubation period of chickens is about 21 days, 18 days for placing, and 7 days for laying eggs. Generally, it is affected by room temperature, and there may be early or delayed hatching.
Natural hatching, with hens hatching eggs, can save labor and provide suitable temperature and humidity, but it is not suitable for large-scale hatching of eggs. Appropriate temperature and humidity control can directly affect the hatchability of eggs. Therefore, choosing the appropriate incubation technology and artificially controlling the incubation environment can improve the hatching rate of the eggs.
During the development of chicken embryos, gas exchange must be carried out, especially after the 19th day of hatching (12 hours earlier in summer), the embryos begin to breathe through the lungs, the oxygen demand gradually increases, and the carbon dioxide output also gradually increases.
If the ventilation is poor, it will cause severe hypoxia in the incubator. Even if the respiration of the hatched chicks is increased by 2-3 times, it still cannot meet the needs of oxygen. As a result, the intermediate passage of cell metabolism is inhibited, and acidic substances are accumulated in the body. , Metabolic respiratory acidosis occurs due to increased partial pressure of carbon dioxide in tissues, resulting in decreased cardiac output, myocardial hypoxia, necrosis, cardiac disturbance and beating arrest.
Comparing the factors that affect the hatching rate, temperature is the first, followed by ventilation. Mother birds are selected to hold their eggs in dry places, and birds are mostly on trees, and the number of hatching is small, so ventilation does not have to be taken into account; artificial hatching is different, and the capacity of modern incubators is tens of thousands of eggs. More than one, in this way, ventilation is important.
Post time: Jun-21-2022