Tabulate the requirements in setter and hatcher for incubation and hatching of chicken egg and give the importance of each of the requirement.

Incubation

The physical factors necessary for successful incubation are temperature, humidity, gaseous environment and turning of eggs. Optimum and uniform temperature inside the incubator is very essential for obtaining satisfactory results. The incubator temperature should be maintained as recommended by the manufacturer. It usually varies from 99.5° to 100.5°F (37.2°C - 37.8°C) for forced draft-type incubators and about 1°F higher for still-air incubators. Low temperature slows down the development of embryo and higher than optimum temperature hastens the embryonic development. When abnormal temperature conditions extend over a long period, hatchability is adversely affected by increase in embryonic mortality and weak and deformed chicks.

Humidity in the incubator affects hatchability.  Dry and wet bulb thermometers are used for measuring humidity.  In fowls egg takes about 21 days to hatch. The ____ ______ _____ _____ ________ ______ _______ ________ __________ _______.
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