I am about to order our first chicks and it is asking if I want the Marek's or Coccidiosis vaccine. We are ordering 25 total but a dozen or so will be meat birds. We have a large hen house and run and they will be allowed to free range also. Are either necessary? I have read where they can't hurt, but I am unsure about eating the meat and eggs with the vaccination. Also, if I choose to not vaccinate, do I "have" to feed them medicated feed? I really don't want to give them any medications. Any input is appreciated! Thanks!