Dexter cattle are a dual purpose breed. They are good for both beef and milk. Both the beef and the milk is the highest quality, but neither will compare to an animal bred specifically for bee4f or milk.
You wouldn't want them to. There are Dexters that have been bred with an eye toward beef production. They resemble Angus and are bigger. That gladdens the heart of a person who is steeped in the beef cattle traditions, but ruins the animals for dual purpose use. As beef improves, milk declines.
It's the perfect balance between beef and milk that makes a Dexter different from other breeds. A Jersey will give more milk than all but the most milky of Dexters, but the muscle to bone ration wouldn't turn a beef cattleman's head.
A dairyman would laugh at the beefiest of Dexters, just as a cattleman would discount the milkiest ones.
For the most part, that is a given. The dual purpose Dexter fills a unique place on the American farm. It is capable of providing a moderate amount of milk while at the same time raising a very good beef calf. All without supplemental feed and without the milk related problems associated with high milk production.
Here is a picture of the racing bull's brother when he was 5 months old:
Here is a picture of another brother, grown up
Here is a picture of his sire, showing you his butt:
My avatar is another view of the sire.