Hi! First post here! Only been a member for 5 minutes lol! Looking forward to some awesome feedback! This is a long story so I'll make it short if possible. Built my coop in late fall specifically to save some egg layers from being butchered. They arrived at my house while I was not there. I saw them for the first time two or three days later and realized they were loaded with lice and mites. I treated with topical Ivermectin roughly once a week for 3 weeks. And ever since then they have had access to tenacious earth almost 24/7. I have yet to see any actual bugs in the chickens since we first treated, but the nits are still present. My first ? Is are the nits still alive or can I safely assume they are dead? The story now continues with me rescuing more chickens. I knew I shouldn't bring more into the flock when the originals still had nits but I had to. I have had these new chickens for probably 2 months already. They look absolutely gorgeous and there are some roosters in the group. However a handful of the original chickens that still have the nits present are losing feathers or are completely broken and just look awful. All the new chicken still look great. I have a total of 17 chickens in a 8 by 8 by 8 foot coop but they have access to a 25 by 30 foot yard on a daily basis. I'm not sure if these original chickens are starting a molt (I've never seen one but I feel it's not the right time of year for molting. However we have had an unseasonably warm winter) or if the other chickens are maybe trying to pick the nits off. Most of the fathers missing are on the back and wings of the chicken where the nits aren't really present. They are fed a mixture of egg laying mash and cracked corn with daily produce. I am on the go right now so I will add pictures soon. Any ideas, tips, or advice as to what's going on or what to do would be greatly appreciated! Thanks!