Hi,
I feed using a choice feeding program to reduce waste. In one feeder, 10 lb. hanging feeder of whole oats, 1 - 25 lb hanging feeder of course ground corn (sifted through a colander to separate the fine and medium ground corn). These feeders are free feed. I Free feed concentrate in a third feeder ( 2.5 oz.Redman's salt, 4 lb. 12oz. of the fine corn I separated from the course, 2 lb. 4oz. Fish meal that I sift so I get a good mix, 1 lb.8 oz. Fertrell's nutri balancer, 12 oz. Kelp, 8 oz. Sucrant (certified organic molasses in cane sugar), 1 lb. 12.5 oz. Limestone, 14 oz. Oyster shell). This makes about 14 lbs total of concentrate. In a fourth feeder, grit. in a fifth feeder whole black oil sunflower seeds. These I measure out 1 lb. per 25 birds per day. Organic Black oil sunflower seeds (BOSS) per day.
Back engineering from feed labels have only gotten me so far in coming up with a recipe. Articles from vets located in India, Africa, or other countries give me much more specific limits on salt and molasses. Salt can easily be at toxic levels, and sugar or molasses can give them diarrhea. These levels I have give my girls a good turd instead of a little cow pie and they also get salt from kelp. I don't think they get enough salt from kelp but they get some according to another article I read.
I'm trying to keep my grains to locally grown organic oats, corn, winter wheat, and BOSS that I can get out of the field in a gravity wagon. Corn is the only one I grind so I can separate it out for concentrate. I soak the wheat to germinate it over three days and break that up with whey soaked wheat germinated in lactic acid. I give them enough wheat so they clean it up in 24 hours. Germinated, or germinated the wheat has the whole grain and is saturated with water so they drink a little less but over the daylight hours they clean it up one kernel at a time so I think it's pretty efficient compared to buying a ground mash and having 40 to 60% end up in the liter.