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Not sure what you mean by bred? Pullets start laying from 23 weeks or so on. A rooster and hens/pullets can be kept together at any age or close to POL./ Point of Lay. A rooster is needed at that point on if you want fertile eggs to hatch by incubator or broody hen. Roosters deposit their semen when mating hens and it is received early in eggs that are developing inside the hen. A hen can remain with fertility of the roosters for upto 3 weeks. Only way to know if an egg is fertile is to crack a few into a dish and look for the fertile disc or to incubate and candle at 5 to 7 days.