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My BO went broody at 9 months.
But as to why "nobody claimed" the eggs by sitting on them, everybody has been spot on: a pullet or hen has to be "broody" before she will set on a clutch of eggs. For the most part, broodiness as a characteristic has been bred out of many chicken breeds because it stops the egg production process. The layer will stop laying when she gets a number of eggs for her clutch, then she sits on those eggs for 21 days until they hatch. THEN she raises the chicks for 3 to 4 or more weeks, and doesn't lay eggs during that time.
Some breeds have more liklihood of going broody than others. (Buff Orpingtons, for example... and Black Australorps, and Cochins, and of course, Silkies.) Broodies don't care if their eggs are fertilized or not. SOME broody hens/pullets will set on golf balls, wooden eggs, etc., they want to be mommies so bad.