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You gotta be careful what you read. Unless the label specifically states 'vegetarian' or non-animal protein sources, you are assured there is animal based protein in the feed. This comes from many sources, from the ridiculous to the sublime. But, a chickens diet should include animal proteins, as it duplicates what they eat in Nature.
Every feed regimen I've ever studied includes some, from one source or another. There are those who would impose veganism on the chicken, but I assure you, it is without the chickens consent.
As for the preferences, well, think about it: sere and dusty, crumbly feed vs. smooth creamy cottage cheese and granola bars. You'd come running, too!
As for road kill and "icky, gross stuff" being in feed, well.... if that is how you would describe such things, its probably best you don't ask further. Oh, and I'd advise you don't go peeking at what your chickens eat when they think you're not around.
Just a word to the wise...