Pekins

i use brown crickets size small/med i put them in a high sided plastic storage container, i feed them any of the following, carrot,cucumber, fresh grass,
cabbage,chickweed, when needed i chill them a bit before removing some it stops them jumping in all directions and put in a high sided container in the flight which i put some forrest floor debri in this gives the livefood you are feeding somewhere to hide and stimulates the parent birds to search for there food,
Baked eggshells put in a blender will give you calcium which you can sprinkle over them..