I know this would be impractical in all but the most extreme of predator control...but has anyone tried parting out said dead cows and spreading em around and seen a difference in reaction.

I have drug off dead cows, goats and a horse here. Coyotes and buzzards made short work of them.

i would add another possible layer on the avoidance of large baits by coyotes...coyote hunters. Theyre legion now especially with the thermal scopes and a favorite strategy is hunting over dead deer. Eventually coyotes would get wise to that tactic. Same way if you set traps right at the carcass, if you dont get em all on the first time, they wise up to it.