Incubation consists of Temperature, Turning and Humidity. I ruled out temperature and
humidity as much work has been done on temperature and humidity is easy to control. So turning was looked at in detail. The results were very interesting indeed. If Night Heron eggs incubated in the traditional way, turned 24 times a day on tilting trays, very slow and limited vein growth and dead in shell. On rollers turned 24 times a day on their side, better vein growth even to complete vein growth but late in incubation and hatching success still very poor. If on rollers turned 24 times a day and also hand turned 7 times a day then success. Complete vein growth before 6O% of the incubation period and more importantly successful hatchings.