What changes to the livestock industry would slowly evolve the animals to become a threat to humanity?

We, humans, hold a lot of livestock. 19 billion in chickens alone. Cattle, sheep and pigs each also number over 1 billion. Currently these animals cannot evolve freely; they are selected on certain characteristics that are beneficial to their human use.

However there are more and more animal well-being laws implemented throughout the world demanding changes in farming practices. What changes to the livestock industry could (inadvertently) cause these animals to freely evolve again? Preferably in such a way that they become smarter, and at some point a real threat to humanity.

I could imagine something like mixing the male and females together and grabbing them individually for slaughter so those that are cleverer would get more offspring.

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What changes to the livestock industry would slowly evolve the animals to become a threat to humanity?

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