Is it normal that the weather room for incubating chickens is getting bigger and bigger?

19 It is normal that the weather room for hatching chicks is getting bigger and bigger.

It takes 19 to 2 1 day for hens to hatch chicks. The boundary temperature changes. If the air is high, it can be as low as 19 days, and if the temperature is low, it will be 2 1 day. From April to August in the south, as long as the hens hatch 19 days, even if no hens continue to hatch, eggs with normal embryos can hatch chicks. The artificial incubation temperature of chicken is about 37.8℃. However, according to the size, variety, environmental temperature and machine performance of eggs, the ideal incubation temperature will change to some extent, but the high temperature is not more than 38.5℃ and the low temperature is not less than 36.5℃. Incubation humidity: the importance of incubation humidity is mainly reflected in the incubation stage, and the relative humidity during incubation should not be lower than 60% to keep it at 65? —70? % is the best. Higher humidity is good for chicks to peck their shells, while lower humidity will cause sticky hair and affect chicks.