yallowchicken81819
In the Brooder
Artificial preservatives, food dyes such as Blue 40, Red 5, any color with a number after it. My friend's chickens have had bad experiences with yogurt. Sodium benzoate is a common preservative in yogurt that, with enough, can cause cancer/sicknessDon't buy yogurt with saccharine, sucralose, splenda, etc. That's not reason to avoid yogurt, that's a choice to avoid artificial sugars (which aren't necessary anyways).
Plain yogurt doesn't contain dyes. Nor does decent yogurt of any variety.
Preservatives? Yogurt is itself a preservative. So is salt. and sugar. Lactic Acid.
You are going to have to be a little more specific please.