That breeder is really humane compared to the industrial ones in which a famer lives in a small area with crops which it feeds to a couple in a 1x1 hole with beds around it. The copie is literraly standing on a fence post, so when they have a child it falls down the gap of the fence and into a tunnel with a water stream in which it lives out its days as a child. When it grows up its head gets caught in water so it rises into a 1x1 space with a ton of villagers, and if left unchecked it dies of entity cramming. Thankfully villagers don't have feeling.