![]() The wet-bulb reading on the thermometer should be 30 to 31oC (86 to 88oF) during incubation for the first 25 days and 32.7 to 33.8oC (90 to 92oF) for the last three days of hatching. In forced draft incubators satisfactory results are attained at a temperature of 37.5 to 37.2oC (99.5 to 99oF). On 24th day of incubation the eggs should be transferred to hatchery. Eggs should be turned at least 4 times daily up to the 24th day of incubation. This can be achieved by sprinkling lukewarm water from the second day to 23rd day of incubation. However, the humidity requirement is higher. Eggs can be incubated in forced draft incubator with the same temperature for chicken. Hatching eggs should be stored in an atmosphere having a temperature of 14oC to 16oC with a relative humidity of 80%. Washed eggs should be dried and fumigated immediately to prevent rotting. The dip water has to be changed frequently. Dirty eggs can be washed using warm water at 27oC to which a detergent sanitizer and disinfectant are added. Washing of dirty eggs improves hatchability. Collection of eggs should be started 10 days after introduction of male. Eggs for hatching should be collected only from those flocks that are in lay for about 6-8 weeks. The incubation period of ducks is 28 days. In flock mating a male female ratio of 1:6 to 1:8 is satisfactory with layer types of ducks while ratio should be narrower for meat type of ducks. For maximum fertility drakes should be older by 4-5 weeks than females. Breeder males and females are selected when they are around 6-8 weeks of age.
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