I am giving two eggs to my broody buff Orpington hen to hatch out figuring that only one will hatch. Will I have problems with development issues with the eggs being from 11 month old hens? Yes I have a rooster and another question with that I have 21 hens and one rooster so are all the hens fertilized. And should I give her more than two eggs, I only want one chick but im fine with getting two so how many eggs should I give her and im starting this today so they will all be the same "age" eggs.