This is the first cow we bought four years ago and her new calf this year. Her name is Lizzy. She's half Longhorn and half Pineywoods.
We are breeding her to this Lowline Angus, Charley.
So far half her calves have been solid black, while the others are spotted in the same pattern she has, with little variation- until now, when the same basic spot pattern shows up, but in brown.
I've looked at lots of pictures of Pineywoods online, and lots of them are very close to her coloration- but nothing quite the same.
There is a Longhorn cow listed on an auction I'm going to tomorrow that has almost the same coloration as Lizzy, though, so maybe it's a Longhorn thing? This is the cow at the sale:
Other cattle breeds that feature white bodies with black points are the British Whites, the White Park and the American White Parks. They don't tend to have so many spots, though. Or the huge horns, of course!

I don't know how long Lizzy's horns were before they were trimmed, but the curve that's left seems to indicate her horns weren't as long as the Longhorn cow at the sale.