junebuggena
Crowing
Crushed oyster shell should be available at the same place you buy feed. Your wife's family may have fed their birds only corn, but their birds probably weren't very healthy, took a long time to mature, and didn't lay many eggs. There are many threads on this site of people who mistakenly only fed their chickens corn. It can cause all sorts of problems, from malformed bones and joints to birds that take over a year to develop enough to lay eggs. If they raise Cornish Cross, then they were probably processed by 6 to 8 weeks old, before any health problems could arise.
