x2Just about any chicken can be used as a meat bird, but some are much more suited to that purpose. There is a good chance that other people are using those same chickens/eggs for their dinner somewhere - especially the roosters.
A lot of people who breed chickens will use extra roosters for dinner. After having watched my first batch of meat birds grow though, they develop more meat in less time than my egg layers, and probably consume less feed then too since they are ready to go in the freezer around 8 weeks.