Cow brush.
A cow brush is nice for a cow but where does it hang? Does it still function properly? It is easily accessible for any cow without any constrictions? Think about the dominant cow that take ownership of all the available space. In Denmark there is a law requiring 1 brush per 50 cows!
Are you going to let the cows graze? Then please read the tip from May of last year. Are the flies starting to lay eggs again? Have you taken proper measures? (Tip of the Month April 2015)