Different dewormers kill different kinds of worms. I don't think any one dewormer kills them all, and if you don't switch up and use different dewormers at each worming cycle, the worms build up a tolerance and you make super worms that are now resistant to the normally used active ingredients. Instead of over-doing the deworming schedule, why not take a poop sample to the vet to check for, first if they have worms, and second exactly what kind of worms they have so you can treat it properly. Just blanket throwing deworming medicine at them won't guarantee no worms and can be more harmful than beneficial.
It just seems funny to me that in the flock your roosters came from, those roosters died and now these roosters-- that came from the same flock -- are also dying. I don't feel like it's the feed. Depending on what state you live in, you might need to report unusual/unexplained deaths in chicken flocks. This definitely qualifies as unusual.
It just seems funny to me that in the flock your roosters came from, those roosters died and now these roosters-- that came from the same flock -- are also dying. I don't feel like it's the feed. Depending on what state you live in, you might need to report unusual/unexplained deaths in chicken flocks. This definitely qualifies as unusual.