So i've decided to worm my chickens for the first time and I went to tractor supply and I got Ivermectin. I'm now wondering if I should even use it. I've heard valbazen will treat all the worms my chickens could have or is there another wormer I could use with ivermectin to get rid of all the worms?! Which wormer should I use to treat all possible worms my chickens could have?!?