Another member recently posted about an antibiotic called Denagard. It's supposed to a great preventative/cure for a variety of poultry ailments. And they say it can be given to laying hens with no withdrawal period. Here's some info: http://www.thepoultrysite.com/focus/novartis-animal-health/2281/denagard-premix-for-poultry-denagard-premix-the-right-choice-from-novartis-animal-health The member who suggested it also posted links to articles about it: http://www.octagon-services.co.uk/articles/avian_mycoplasma.htm http://www.octagon-services.co.uk/articles/mycoplasma_sensitivity.htm Here's info from the Denagard website: http://www.tiamutin.com/vet-poultry/firstchoice/en/protection.shtml And a link to a place that sells it: http://www.qcsupply.com/catalogsearch/result/?q=denagard If anyone else has information/knowledge/experience with this product, please let us know! If it's all it claims to be it sounds like a terrific product. And if you use it, where have you found the best place to buy it?