My Orpington hen Thelma laid her first egg today...I just put out oyster shell about Three days ago because she and 3 others are about weeks different in age. I was told to begin Layer feed when they started laying (2 are 20 weeks and she and another are 24 weeks) my question is they are eating Purina starter/layer medicated....so can I eat the egg? Also, can I mix layer feed into the starter/grower and feed it to all of them...need advice please