I use an old broomstick handle with a plastic measuring cup attached to the end of it. I put feed into the feed troughs lined up against the corral. Turn the cows into the lot and pour ultra boss, standguard, sabre or whatever into the plastic measuring cup that is attached to the broomstick. Then while they are busy eating, standing next to the corral across from the feed troughs I pour the pesticide along there back beginning close as I can get to the tailhead and pour along the back toward their head (in case they back up I'll still get a pretty good dose on). Then fill the plastic measuring cup again and do the next one and so on. Usually works pretty well with about 10 head and 2# of cube for each. It's raining now but I can take a picture of this hi-tech invention and show you if you like.