Okay all my hens lay eggs including my guineas and my duck. I have 5 roosters, 3 drakes, and 2 cocks. Even with all those boys, can I be for sure that all the eggs are fertile? If not, all my girls lay brown eggs, except for the duck and one hen that isn't laying right now (she's broody). I don't want to waste time putting any in the incubator unless I can tell that they are fertile.