Use mainly oral drenches here and a specific lice/fly pour on with heifers. I am much happier with the results from the white doses over the pour ons. Any time we do use a pour on, Bimectin is our mectin of choice. Its a very flukey farm here so we dose the cows 2 while dry, 4 weeks apart and then a third dose when they calve, sounds overkill, but any year they didn't get the third dose you'd know about it. Did have a run of rumen fluke here a few years back and used Pharmazan. Ozyclozanide is the ingredient you need to look for to treat rumen fluke. Rather than wrestling very heavy in calf cows in the crush, the last couple of years we mixed meal and Alex and fed it to them.