Dusted with sulfur dust and oiled the with castor oil(CO). When you put a bird or animal into quarantine, you may want to treat for parasites at the same time. Did the goats with lice come from the same place? If so, there could be the source of all these problems.
I've gotten chickens from other places and found them to have scale mites, lice, etc. I usually even dose those birds with CO orally for any internal parasites they have also. I learned my lesson years ago about that and brought scale mites into my flock, even though the birds I brought in didn't look like they had them at all.....so now I just oil up the scales of every bird that comes, even if they won't be in the same coop as my birds and are only here for butchering.
Did you do any research about such things before you got each species you now have? If not, winter time is a good time to get some research in about what each species parasites are, what they look like, how to prevent and treat them, etc. I spend a lot of time each winter looking up things that are pertinent to my care for the animals. Usually I'll research for several months up to several years before adding a new kind of animal or type/breed of animal.