Years ago, all scratch grain mixes contained mostly corn with a little milo for color and sometimes a little wheat. When corn prices got high, scratch mixes became mostly milo, which i mostly keep pigeons and they prefer more milo in the mix, so that's fine by me.
I have my first batch of peafowl - they are 4 months old and i started them with chick starter. I will switch to gamebird feed of some kind eventually. I was surprised how little they eat compared to other birds.
The first few nights that i had mine out of the brooder, i had a small florescent bulb hanging about 5 feet off the floor, and just before dark, when the bugs would come to that light, the birds sure enjoyed eating them. It's remarkable how well they like those bugs.