Main Problems Rearing, Incubation, Prevention Maximum incubation success for best hatchability was obtained by: Once/hr turning frequency, incubator temperature ranged between 36.0- 36.4 °C without hot-spots (0.3 °C maximum temperature difference inside the incubator), rotation angle of 60-90° and around 15% weight loss during the 39 days (Schalkwyk et al, 2000). Be sure that the egg is not upside down. Egg weighing and candling after 14, 21 and 39 days from incubation.