i have used Wazine, I've heard (and believe) this is the only wormer that has been approved for chickens but not egglayers. Which poses the problem of not having a 'withdrawal' period listed. The other problem with Wazine is that it only targets Roundworm.
The upside, is that I used it last January when my girls had pale combs and weren't laying, and it seemed to do the trick.
My girls haven't laid any eggs yet but they will. So can I give them Wazine? What dosage did u use?