I have tried the blocks, shots, etc. The blocks I never knew which ones was getting how much- the shots I have to pin them up- the best and easiest to use, and for seeing the best results for my small herd I have found is the Safeguard paste. I dump feed in the trough and as they are in a line eating I squeeze out enough for a cow on top of the feed and continue down the line. I can tell a big difference in them since I used the paste, I guess I wasn't getting enough wormer in them with the blocks.