I have a flock (8) Americauna hens and one Light Brahma rooster. I want to add a Americauna rooster to the flock to start to hatch Americauna eggs. So far we have just been taking and eating the eggs. My question is how long does the Brahma rooster need to be separate from the hens in order not to have a crossbreed issue with the eggs. In other words How long does the rooster's DNA hang around in the hens?