Embryo require O2 and release CO2 during the
development. If CO2 is too much then the mortality
embryos would be high and causing low egg hatchability.
CO2 volume required ranged from 0.5 to 0.8%; needs O2
about 21% and air velocity within 12 cm / min. In machine
traditional tetas ventilation arrangement is highly dependent on the nature,
whereas in modern tetas machines have been generally regulated
automatic with special equipment.
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