![]() The relative humidity should be around 60 per cent during the first 18 days of incubation and 70 per cent in the last 3 days for optimum hatchability. In fowls egg takes about 21 days to hatch. Dry and wet bulb thermometers are used for measuring humidity. ![]() Humidity in the incubator affects hatchability. When abnormal temperature conditions extend over a long period, hatchability is adversely affected by increase in embryonic mortality and weak and deformed chicks. ![]() Low temperature slows down the development of embryo and higher than optimum temperature hastens the embryonic development. It usually varies from 99.5° to 100.5☏ (37.2☌ - 37.8☌) for forced draft-type incubators and about 1☏ higher for still-air incubators. The incubator temperature should be maintained as recommended by the manufacturer. Optimum and uniform temperature inside the incubator is very essential for obtaining satisfactory results. The physical factors necessary for successful incubation are temperature, humidity, gaseous environment and turning of eggs. Incubators, which provide similar environment as that of broody hens, but more efficiently, are used at present for hatching of eggs. This method of hatching is highly unsatisfactory for large-scale production of baby chicks. Only 10 to 12 eggs can be put under 1 hen. ![]() Desi hens proved to be ideal for this purpose. In early days eggs were hatched by placing them under broody hens. Hatching of eggs refers to the production of baby chicks. ![]()
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