You have to check the formula. Some say to mix with mineral oil or diesel for rubs. Some of the spray ons are so dilute, they would not work in a rub.
I personally do not rotate my sprays on the horses and cattle. For a spray, I really like Piranha. It is in the horse section. Works great on the cows also.
I have used Ultra Boss poor on also, with just ok results.
My main fly stuff for the cows is the powder bags. My cows powder their faces every day.