Hi all, I have reviewed the past posts on deworming laying hens with various anthelmintics that are not labeled for laying hens. I have had free range laying hens for quite a while and have not had too many internal parasite issues until this year....the dreaded round worm. I have had several conversations with two veterinarians about using non-labeled for laying hen deworming products and both have advised against it since studies have not been done to show that dewormers do not systemically enter the ovum and potentially be in every egg that is laid after using chemical dewormers. I do sell my eggs so I am concerned about the undocumented withdrawl time for fendabazole. I tried Rooster Booster daily in their feed mixture for 3 weeks. I am on my second round of this product after a 10 day rest period and while I have seen some improvement in egg production, I still have some pasty rear-ends. While I think this product may work for smaller flocks, I have 35 hens and they free range over the entire farm. They are eating the Rooster Booster pellets but I don't think the product is effective in ensuring each hen gets the proper amount needed and it really is just an antibiotic. So I am questioning its effectiveness. I use ACV in drinking water for all farm animals. I do not believe in using DE as this kills beneficial insects as well as the bad ones, so that product is out and not shown to be an effective internal parasite control method anyway. So what is consensus for withdrawl period for Fendabazole? I am ready to try this route and see if I can knock out the round worms. I was going to use 2.5 TBLS of Liquid Safeguard per gallon of drinking water.