What is considered livestock varies over time - chickens range from "free range and can survive in the wild" to "so fat they can't live". One guess as to which is the most common by numbers - one reason that if you do decide to have a backyard flock, go with something "more natural".
replyMore dangerous in all these is the monoculture - a hundred years ago we would have a wide range of crops and livestock; now 90% of meat chickens are probably the same genetically; similar with cows and bananas and corn and rice and pigs, etc. That sets us up for a "wipe out 90% of chickens" risk.
Monoculture is definitely a risk, one exacerbated by megacorps and overly corporatized industry - but if you look at the history of ag departments they have introduced multiple variants and variations across crops and animals time and time again. They also work with smaller growers in communities in many ways - natural pest controls consultations for example
replyJust a fun fact. We're pretty close to the anniversary of the dust bowl. . . Which was driven by farming practices to raise monoculture crops.
replyNo purpose to this other than this is a very long term problem that, I believe, will bite us in the ass at some point.