Your comment take the "best lie" of the year award.

All mass produced live stock have been carefully selected for breeding and slaughtering, all of them, chickens, cows, pigs, ducks, the lot. Not only selective breeding, but also chemical treatment due to the conditions they are grown in.

So no, they have changed susbtancially.

Do you think the "original" pig was this fat?

The "original" cow produced this much milk?

The "original" chicken produced this many eggs and meat?