Your fertilized Kuroiler eggs should take 21 days to hatch into chicks
You could get the ratio of Hens to cocks between:60/40; 70/30,or 50/50.
How to Identify fertilized eggs
Ensure you have a candling Machine to check your eggs which are going to the incubator. This machine should always be disinfected.
Candling is the only method of testing eggs for quality, internally and externally, without breaking them. It consists of inspecting an egg with a beam of light that makes the interior quality visible. A very simple form of candling is placing a candle in a dark room and positioning an egg in front of the flame and looking at the interior quality.
A fertilized egg will have an embryo showing as a dark shadowing withing the egg and an Unfertilized Egg will look uniform.
More Tips and Techniques for keeping Fertilized Kuroiler eggs
Ensure you have a safe place where you keep the Eggs, and enough Trays.
The first eggs produced when the Hens are between 5-6 months should be just sold for eating.
The eggs produced when the Hens are 7 months are the ones which are mature and which should be put in the incubator for hatching.