> We just purchased a long horn
> heifer, I noticed that she is
> losing her hair in large patches.
> Could this be a fungus of some
> sort or lice? Our other cows don't
> have this problem.
If you see her rubbing on trees or posts more than likely it is lice. It is that time of year when lice is pretty prevalent. You need to use some type of topical pesticide like " de-lice" on her and the other cattle. It will spread to the other cattle.
I am no expert but it is best to isolate the infected animal,better one than twenty. And Lime-sulphur dips weekly for up to six weeks are effective in treating chorioptic mange. Invermectin is pretty quick and sure for beef cattle.