I will be expanding my flock. I'm talking two-three hundred roosters and chickens next year. This year was horrible. I hatched about 100 birds and have about 70 left. The 30 that died mainly died of lack of food, since I left them about 30 a group (probably should've put 15 per group). About 10 died of disease. I contracted a new disease in my farm. ONLY ONE eye of many baby chicks would shut closed, but they would not die. Instead I treated them and you can hardly tell they even had the disease. I looked it up and it looks like mycoplasma rather than Marek's. But here's the thing; I order 50 Easter eggers off cackle hatchery and they were all vaccinated for Marek's. NONE OF THEM got sick with the disease I mentioned earlier. I know my birds will be carriers of the virus so I want to inject them with Marek's disease for next year. I also want to inject them for Cocci. And apart from all this, I want to give them LS-50 medicine as chicks. My two main questions 1. Are there any other vaccines I need since I will have a huge flock? 2. Injecting the chicks with these two different vaccines and giving them LS-50 be bad for them in the near future? will they die since I gave them too much medicine? ANY INFORMATION IS MUCH APPRECIATED. THANK YOU.