Sexing: Being able to tell male from female.
Sexed at birth: The male is one color, the female is a different color. The primaries are one length, the males are another...it's a sex-linked trait.
We cannot tell you what your hatch rate will be. It all depends on how good the equipment is and how stable it is.
Please...it is "cockerel." You will know that the cockerel is breeding then hens when he hops on top and does the breeding dance. You will know the eggs are fertile when you put...