I'd like to start raising 6 RIR's and 6 BR's for eggs and meat. After reading BYC for a while I started thinking about the variances within the breeds. My priority at this time is egg production. In another year or so I'd like to increase my flock using my own eggs. Eventually my flock will be providing both eggs and meat. Considering my goals for the flock, should I buy Standard, Heritage, or Production day-olds? I'm beginning to like the idea of raising purebred lines but egg production and later, freezer meat is most important in the beginning. Can anyone explain the difference in the 3 options and which would fit my needs the best?