i helped raise chickens when i was growing up...only they were not like the ones i have now. I think mostly what we had were broilers that my step dad wanted to help with in order to get extra meat. My chicks have all been vaccinated for Coccidosis, and Marek's disease. I have to give them unmedicated or it nullifies the vaccine. I did not know about the feathering, as the others are doing awesome! Just wondering about the mealworms...I was told by the hatchery to start at 95 and lower it 5 every week. That is what I will be doing today. They are sooooo pretty!!