I've had a necropsy come back positive for mycoplasma. When I told the vet I planned on culling the flock and starting fresh, he cautioned me that backyard flocks almost always have mycoplasma! He said if I'm not planning on selling the eggs/meat, I should just keep them and treat them with antibiotics as needed. What the hey? What would you do? I have 8 4.5-week-old chicks, was planning on this being my starter flock that will eventually supply my family with all the eggs we need and maybe even eventually all the meat we need.