This is the time of year we see scratchy cattle appearing with lice infestations. Lice obviously cause a lot of irritation and can be associated with ill thrift and cattle wrecking gates and posts, etc.
A salvage treatment early spring may be required (better to treat in early winter). The critical thing is to dose all cattle with an effective dose and product. Tempor will treat only lice, whereas many worm drench pour-ons and injectable drenches will also kill lice, but they are not all equal. Genesis, Eclipse, Dectomax and moxidectin pour-ons are generally very good options.