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I do it twice a year here with a broad spectrum wormer after a first-time worming with a narrow spectrum wormer for safety's sake.
I always do Wazine once (or only*) in the bird meets any of these criteria:
- The bird hasn't been wormed with a broad spectrum wormer in over 6 months
- The bird is underweight and/or has diarrhea
- The bird is shedding any worms, or a worm was shed in the flock
- The bird is under four months old*
- The bird has an unknown worming history
Then I go back (in birds over 4 months old) and worm with one of the broad spectrum wormer: ivermectin 5% pour on, fenbendazole, levamisole, Valbazen.
I'm taking a look at Rooster Booster's triple action wormer to take the place of one of those wormers as it requires no withdrawal times.
If you use a broad spectrum as the follow up, you kill not only adults but larva and stop the cycle somewhat.
The rest of worm control is about hygiene, keeping dry ground (sand is better than soil, dried horse stall shavings are better than hay, etc), not crowding birds, not hand feeding any earthworms, keeping fly populations down, lots of space, etc.