I have a heifer that has been losing a little bit of hair over the past couple of days. It is obviously something that itches because she is rubbing her neck on posts quite a bit. From what I can tell, the hair is coming off from the neck area in small chunks. I would think maybe lice or something, but it has been down around zero degrees for the last couple of days. Can lice or some other parasite survive in that cold of a temperature? If not, what could it be? How would you go about treating it? Thanks for the help.