Yesterday we found the first egg laid by our 4.5 month old pullets (we think from the RIRed as she was acting strangely defensive when we picked it up). I am still feeding them an good starter-grower crumble feed as well as regular size grit and various greens (lettuce, dandelions, chick weed) and watermelon rinds, occasional grub found in the garden, etc. They do not free range. Should I start giving calcium? Should I switch feed? even though the others are not laying yet? Thanks for the input.