Commercial chick starter isn't "angelic" either but it IS complete! It has all the nutrients, vitamins, and minerals in the correct amounts that chicks need to grow and be healthy.Klmclain1: Thing is, the first one was dying when I opened the box. So maybe the mix isn't angelic like a commercial feed, but that is obviously not the issue. I'm convinced it's a disease of sorts.
Chicken_Pauper: Nope, no cedar shavings.
Edit: The chick poo is normal until right before they die.
Of the things you listed that you are feeding them: oats, barley, linseed oil, and wheat bran..... NOT a balanced or nutritionally complete diet for chicks. If this is all they have along with grass etc. then honestly I'm not surprised they are dropping like flies. And they would need real grit, granite chick grit to digest those things. Egg shell is not grit.
I have never, ever had to supplement chicks with vitamins or probiotic's or any other nonsense. They get their commercial chick starter and that's it. As was mentioned it is available in organic.
Yes, it is common to loose a chick or two right after shipping but if they start dropping like flies you need to look elsewhere and in this case diet seems to be the most glaring problem.