I don't know, the domesticated animal that we've classed as a species for the longest time is probably something like a dog and we're talking 30-40,000 years at a guess?
Plenty of things haven't changed much genetically in hundreds of millions of years, they got that niche on lockdown.
And remember that some of the genes in us are the same as lifeforms 500+ million years ago, we don't think of ourselves as representing these genes often.
^ Need to work on this and talk about the origins of life reflecting in all living creatures and how almost all genes are shared anyway and are being expressed in most wild life.
Pretty sure i've just talked myself into the answer being "no" - no chicken or farmed animal specific gene is represented more than non-farmed animal genes
"most successful gene" isn't giving me much on google, but i'll try and find what gene has been expressed in the most amount of sentients to date.
With pigs I think it's likely that we're using and abusing them for the time being, and we'll send them packing like last nights prostitute as soon as it's convenient to do so. What we want is cheap healthy tasty food and animals don't fit the bill perfectly, even ignoring the sentience thing.
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