One reason to get more chickens each spring is to have eggs thru the winter, as the adult hens will molt and probably stop laying for a while if not for the entire winter, whereas the new pullets will continue to lay. However, all my 2017 pullets also molted last fall and stopped laying for a couple months and for a while I had zero eggs from 8 girls! (A lot of people on BYC reported their pullets were molting last fall. I didn't know this could happen, but apparently it can.) I can take extra birds to the Joplin poultry swap, just have to decide which ones should go. The extra cockerel for sure.