Every Saturday morning, every Sunday morning, every Christmas you get up to take care of the cows. Feel sick? You've got to get up and take care of the cows. Want to go on vacation? Can't, there's no one you can leave the cows with. It's a hard life - maybe a satisfying life in some ways but there are a lot of sacrifices.
The author points out that only one of his brothers wanted to take over the dairy. He doesn't point out that without that one brother with the insane work ethic the farm would have shut down years ago. It's not a sustainable business model.