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While I almost always agree with Cmom, my opinion is a bit different in this one. The 10 to 1 ratio is used by commercial operations that produce hatching eggs to insure fertility in pen breeding situations. This is where maybe 20 roosters share an enclosed facitlity with 200 hens. They don't want to feed any more roosters than they have to, but they have determined that in the pen breeding situation, due to the random nature of which rooster mates with which hen and the different fertility rates of the roosters, they need the 10 to 1 ratio. If the fertility rate starts to drop, they take out a few older roosters and put in a few younger more active ones.
As long as the rooster is active and fertile, I find that the ratio can be quite a bit higher in free ranging flocks. You need to check for the bull's eye because the fertility and virility of the rooster can vary quite a bit, but I find that one reasonably young active rooster in a free ranging flock can usually keep a lot more hens fertile. With eleven hens, you are in great shape. I'd be a bit surprised, provided the rooster was any good, if you did not get real good fertility with one rooster and 15 to 18 hens.