Grasshopper, you forgot one thing........ How often....... We worm at 2,4,6,8, 10,12 weeks, without fail. Wazine for the first 2 wormings, and then alternate Safeguard and Valbazan thereafter. Then about 4 x a year depending on the fecals we run.You must weigh mature birds to get an accurate dose.Makes a huge difference.I learned from DragonLady. She shared with me what to do. I actually give them the Ivermectin inside their beak. They drink it. (DragonLady, don't you dare share the story that popped in your head just now) Just be sure to point the syringe (without the needle!) towards the side of their mouth. Not in the middle. They can aspirate if you shoot it down the middle.You have to dose by weight and choose which one by age. When they're young I use pip ( Wazine) then I alternate Safe Guard (a goat wormer) and Valbazen. How much depends on their weight. A Vet would give you the correct dose. Or you can search for doses here in BYC. Some dose in their water. Just remember that in the summer they will drink a lot of water, but in the winter you might have to add a day if they're not drinking as much.