WHAT DOES CHICKEN FERTILE EGGS FOR SALE MEAN?

Coweta,Oklahoma I am setting up a listing for twelve gentle brahma hatching eggs, I've 3 hens and a couple of roosters. So fertility price is really higher. The hens are laying pretty much and so hatching eggs for sale hampshire far this calendar year I've hatched every single egg they layed To date. The believed lay date for these hatching eggs