Artificial incubation is a necessary condition to obtain a high hatching rate. Turn the eggs purpose is to change the embryo position， prevent the embryo and shell membrane adhesion promoting embryonic movement， the embryo is heated evenly， development neat， well， help amnion movement， improve amniotic blood circulation， so that pre-embryo development in the late avascular zone and urinary bladder chorionic normal growth and development， "closed"， "closed door" good， smooth entry into the amniotic fluid for embryos protein absorption， qualified birth weight. Turn the eggs can also slow down the loss of amniotic fluid， the embryo in a wet environment smoothly pecking shell hatching.
Turn the eggs in the eggs during incubation in the important role of embryonic development is obvious. Then turn the eggs specifically how to operate， turn the eggs and egg-turning angle of how to determine the frequency， which many monographs and has a variety of programs and ideas in incubation practice. Usually eggs egg turning angle to the horizontal position of helplessness or left turn and right turn  different depending on the machine type 45 °， duck 50 ° ~ 55 °， oval 55 ° ~ 60 °， which we view is the same. Stage of egg turning frequency of the more contentious， there is every 4 hours， 3 hours， 2 hours， 1 hour turn the eggs once a variety of viewpoints. The company combines years of practical experience， to discuss this issue through experiment.
Egg turning frequency is twice the eggs during incubation the eggs turn interval between， turn the eggs are simply a long time. 1980s， domestic incubation equipment factory ships to turn the eggs frequency is fixed at 2 hours; 90s production equipment hatch their eggs over frequency are generally adjustable from 05 hours to 2-5 hours， basically set at the factory for 2 hours incubation most producers also used as criteria， no adjustment. My company after 10 years of hatchery production practice， during incubation temperature， humidity， ventilation conditions， combined with species， season， egg cases by trial and summary， production performance has reached a higher level. In recent years， by adjusting the frequency turn the eggs， a bold attempt to make the score hatch has a new breakthrough， we received better results.