Well, personally, I'd go with half that number only because of the weather. The bigger they get, the harder it will be for them all to get under her... BUT since you just set today, they'll be hatching about the 3rd of April... Might be ok... I don't know how soon your spring comes there in MO, but... I only say that cuz I am in MI, and I have several broodies right now, they are insane, I swear, and even with the bigger girls, I only let have 6 to start so they can keep them warm in the winter yet. One of my girls has 3 chicks now, and I keep her in the garage because she's a little things. She hatched 5, two died from cold after getting out of the brooder and not being able to get back in. They did it on separate days, and the mama is not going to abandon the nest for one wayward... ANYWAY< gettting side tracked.. Here she is, and even with 3 left, she has a dickens of a time... But she sure is dedicated to them.