Another off topic reply (can’t help it either).
You’re intentions are well, but you’re theory stinks imho. I pity the cows that produce an enormous amount of milk and have such enormous utters that they come nearly to the ground. The breeding program in my country made milk monsters.
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These cows are so unnatural that they can’t live solemnly on grasses anymore but need special power food to produce so much milk. If you create a monster with enormous utters there is no way you can give her a really pleasant and long life.
This is what commercial farmers do with all producing animals. They make monsters. Chickens originally were laying about 12 - 20 eggs a year. A century ago that increased to 120 . And now they lay an egg every day. And the farmers are still ‘improving’ . Proud that their chickens lay over 360 eggs a year.
This comes with a price. Just ask people who bought rescues from a commercial farmer.
You mentioned that my "theory" stinks. What theory would that be, pray tell? I don't mean to be snarky, but just so you know I was involved with dairy goats and dairy cows in one way or another, for more than forty years. Most of what I say is from personal experience and personal observation, not abstract theory.
Monsters? Cows with udders like the one in that picture just aren't seen in any progressive dairy any more. At least not in the United States. They just aren't. For one thing they are a nightmare to milk. For another an udder like that would be very prone to injury. As big as that udder appears to be I can guarantee she is not milking anywhere near 200 pounds of milk. I would be very surprised if she was milking sixty pounds of milk, if that. Not only is that cow's udder terrible, she has extremely poor conformation in general and she is just very unsound. She doesn't look healthy either. I would be embarrassed to own a cow like that. Even when I was milking and testing cows, and that was some years ago, I very seldom saw cows that bad. A former boss did have one cow with an udder similar to that one. One. He bought her when she was dry and he had no idea how poor her udder was until she freshened. Although she gave a fair amount of milk she did not last long in the dairy. She was just more trouble than she was worth.
Before you say much about udders, see if you can get on one of the web pages of any of the bull studs. SelectSires is one. There are many others. I haven't tried the web sites but I have browsed through the catalogs. You should be able to find pictures of the bulls and their progeny. I guarantee you won't see ANY udders like that one.
What do you consider to be a long life for a dairy cow? Five years? Ten? The almost twenty-year-old cow I mentioned in another post was kept around that long because she was a pet, but even then she milked enough to pay for her feed and her udder was nowhere near as bad as that cow's is. If it had been she wouldn't have lived to be nearly as old as she was.
Some dairies do keep their cows on pasture at least part of the year. Depends on where they are. Not many feed their cows only on grass. They never did. Even my uncle's cows were fed grain when they came in the barn to be milked. I did come across one dairy that advertises that his cows are fed only grass. I don't know how he can afford to stay in business. By looking at the pictures of his cows you can see production is very low. Cows don't look so good either. Now, if he had Milking Shorthorns rather than Holsteins he would be a lot better off. Shorthorns are bred to produce well on grass. I don't know why he doesn't have them.
Try to access the web site of the Iowadairyfarmer. His is a family operation. I think he has some videos on youtube. I see him on facebook. He posts videos of his barn, the milking robot, the feed robot, the free stalls, artificial insemination, and the rotary cow brushes where the cows stand and get their backs and heads scratched. Since I cannot be around cows any more that is how I get my cow fix. See if you can find it. You may learn something.
You think dairy cows live a life of misery and pain. They don't. Also, cows that are giving 200 pounds or more of milk do NOT have udders dragging on the ground. Their udders are pretty much above the hocks. I think this about covers it. At least I hope it does.