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Actually, it's fairly easy. If you crack the egg open, and the innards are intact but there's no bull's eye, it's infertile and therefore the breeder. If you crack a dud open and the innards are scrambled, it's the PO. If you can see detached/ruptured air cells when you candle, it's the PO.
There's more factors involved than just if the egg is fertile or not. Diet is another factor that determines the egg's viability and if the chick can make it to hatch.
Actually, it's fairly easy. If you crack the egg open, and the innards are intact but there's no bull's eye, it's infertile and therefore the breeder. If you crack a dud open and the innards are scrambled, it's the PO. If you can see detached/ruptured air cells when you candle, it's the PO.
There's more factors involved than just if the egg is fertile or not. Diet is another factor that determines the egg's viability and if the chick can make it to hatch.
