I have a simple questions that I know has multiple opinions. Got my first eggs yesterday from my pullets so it is that time to change to layer. So Purina, Nutrena, Dumar, or FRM or does it really matter? I was even told to just use Flock Raiser, that it did well and gave good hard shells. Does anyone know which is the most complete so that I will not have to add oyster shell? Maybe that is the answer. Thank you for any opinion and appreciate any help. The girls look great and I have quite a mixture in 34 pullets.