This is our second year to brood chicks. We had 100% success with our 2015 flock..... yet disasterious results thus far this year. Below is the basic chain of events.... our babies get medicated feed, parakeet grit, and tiny amount of chick treat mixed in and offered free choice all day. They get fresh water 3x day. They are in our homemade brooder out in the garage under a warm light that keeps the temp around 90 and they have ample room to move to the other end of the brooder if they get too warm. We purchased 2 Barred Rock pullets from a Mother Earth News Fair three weeks ago. They had the dreaded "pasty butt" from day one and we washed their fuzzy butts usually once a day or it would build up on their vents and cause them distress. We chalked it up to their geneic make up as they never "squatted" to poop, thereby leaving it deposited until we removed it manually for them. Even grit added to their diet didnt help. When we purchased them, we were told they were "bred to be disease free and that vaccinating them wasnt necessary.....so they were not vaccinated. Their legs seems to grow and their wing feathers were beggining to change from fuzz to actual feztbers, however they didnt really seem to "thrive" they stayed very small. A week later, we received our first mail order back of 5 hens and a male Silver Laced Wyandotte. Upon arrival, they seemed happy and happy and were very energetic and happy to be out of this shipping container. When placed in the brooder with the two Barred Rocks, we could immediately see just how small our Rocks were who, at 2 weeks older than the Wyandottes were significantly small in girth and much more energy. We chalked it up again, the basic genetic difference between Rocks and Wyandottes and just kept and eye on them. We lost one of or Rocks three days after the Wyandottes (whom we paid to have vaccinated!!) And we lost our second Rock two days later. We lost our first Wyandotte on Friday. We added 4 new Rocks to the mix just yesterday and have already found one more of our Wyandottes dead this evening....... we are devastated and clueless as to what we are doing wrong and wondering how in the world our 2015 ladies managed to survive our lack of parenting!!! Any ideas or suggestions to help us from loosing our entire flock and our sanity would be greatly appreciated!! UPDATE: We have since removed all treats and grit and have left only the medicated chick feed for them to forage free will. We have also now added the powdered version of Corid to their drinking water and will continue that for 5-7 days. We are hoping and praying that we have seen the last of our babies die from whatever it is that they have freely passed to each other. Any other suggestions or advice is always welcome! I can't express enough thanks to those who took the time to reply so quickly that I was able to take immediate action (call feed stores to locate local feed stores who had Corid in stock) and to start getting our sweet babies back on track to healthier days ahead!