On the 6th to 8th day, begin candling the eggs. For this, 10% of the eggs were candled to analyze the embryo's development, veins, and other features. At the 6th to 8th day, there is no need to candle all of the eggs. All eggs candling should be done before start of hatching day so that infertile and underdeveloped eggs can be removed .
Note: - Do not keep the eggs outside of incubator for 10-15 Minutes.