I purchased a 50 lb bag of Start and Grow and on the attached ingredient label it read in part... "Use as the sole source of amprolium. Do not change the litter while giving this feed unless absolutely necessary." I have done the usual internet search and every thing I read contradicts this. I am confused and I would bet others are as well. Can someone clarify what I should do for my 17 two week old Wyandotte chicks living in a 4 foot by 4 foot brooder with pine shavings litter.