Mareloo, the more your chickens free range, eating bugs and grass and other things the less commercial feed they will eat. They seem to have an internal mechanism that tells them what they need to eat such as extra calcium or more protein.
There isn't too much difference in starter and grower. I think most places offer a starter/grower mix that is good for them up to the point of lay. There is also broiler feed (which I cannot get) that is less expensive and given to meat birds who will have a short life span. There is also feed just for roosters as they don't need the same calcium as hens. It is a wide and varied feild out there when it comes to feed.
My chickens have free choice commerical feeds available all the time. I have feeders with scratch grains available too. The current scratch has wheat, oat, millet, flax, sunflower seeds, barley and corn. I don't consider it so much of a treat but just extra. They don't eat an over whelming amount of it. In fact one of my orpingtons lays her eggs in that feeder box every day. Go figure LOL with the cold weather setting in (27 F yesterday morning) I do give them cracked corn every evening to ramp up their body temp. When I toss the corn onto the floor they go nuts. They also get an occassional big scoop of black oil sunflower seeds.
I don't worry too much about their nutrition. The commercial feeds is not what they eat as their main diet even though it is available all the time. They get most of my kitchen scraps (raw vegetable peels, meat scraps, whole grain breads, yogurt, rice, boiled eggs, etc). Yesterday I had 4 loaves of whole grain bread and the leftovers from where I had made chicken and dumplings - lots of scraps and bones I boiled down to a rich broth and poured over the bread, a pile of egg shells I had been saving from the kitchen, celery, carrot, and collard peels and stems, deer meat scraps (I had cooked down the scrap meat from where a friend had given us a deer and as I prepared the meat for the freezer the junk/nasty stuff I cut away I cooked up for them). They go nuts for the meat scraps. They also eat whatever they can forage when they are let out of the hen house.
I did an experiment over several days and weeks to see what they eat. With just commercial feed and staying indoors (when cold and raining) I have to fill both of the 12 pound feeders daily. When they free range I fill them every third day. When they forage and I make them a big kitchen scrap dinner they don't touch the feed. This works for me. I cook daily and I have a wide and varied selection of things to feed them.
I know there are some people who advise not to feed the chickens human food. I find this ridiculous. My chickens are working farm animals. They have a purpose here and not just pets. I don't have 3 or 4 fru fru birds that I pamper. I have 47 pullets, 3 roosters and 27 meat chickens, 2 turkey hens and 6 guineas that eat alot of feed. Feed gets to be very expensive when that is all they are eating. It would be extremely wasteful of me to throw out scraps and kitchen leftovers to the garbage pile when it is good, fresh, nutritional food that an animal can eat - just like slopping a hog. The pullets are being raised to provide eggs, the roosters well I might want fertilized eggs (but Elvis and his 3 girls are my husbands - that's his call), the meats birds have a short life here their purpose is for my freezer, the turkeys are for Thanksgiving and the guineas we are testing the waters and soon they will be culled for the freezer as well (pretty sure I have 5 males and 1 hen - just my luck).
This is a really good conversation. I would love to read more of your thoughts as well as what feeds are avialable where you are, Mareloo.
P.S. Mareloo, this is completely off topic and forgive me if I am being rude but - are you a man or a woman? I can't tell by your name and I'd like to know who I am talking too. LOL
When I read often I put a voice with what I am reading with yours I cannot. LOL