the thing is, once a hen is fertilized she is fertilized for at least a week. I'm not sure exactly what the timeframe is for quail but for chickens I do know it. What happens is it takes several days for the egg to be formed in the hen - so, day 1 the roo jumps on her, the egg she lays that day has nothing to do with the roo that jumped on her that day. The fertile egg turns up from memory 10 days later. I have a rooster I sometimes lend to a friend who has no roo. You start collecting eggs at least 10 days after the roo goes to work, and after the roo goes home the girls are still laying fertile eggs for up to 2 weeks. I've incubated eggs from her girls from 2 weeks after my roo came back and they were fertile. So you would have to build this into your assumptions of whether eggs are fertile or not. The roo doesn't have to get at the girls every day to fertilize all their eggs either, every 2 or 3 days is sufficient so in fact you could have 2 breeding pens with one roo going from pen to pen every second day (kind of like a plural marriage setup!)