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I disagree with this. I've had one rooster and a dozen hens and had a hundred percent fertility. To my understanding industry standard for large scale breeding operations is 1 to 10, and those folks have a lot riding on fertility.Didn't notice this before but will just address it now...
Many roosters can't reliably fertilize more than 5 hen's eggs. This is a generalization but nevertheless more true than not for many breeds.