What is a british cow barn called?

There isn't a specific, unique British term for a cow barn. While Americans might use terms like "barn" or "cow barn," British people would likely use terms like:

* Cow shed: This is the most common and straightforward term.

* Byre: This term is often used in Scotland and northern England.

* Cattle shed: This is a more general term that can also refer to a building for other types of cattle.

Ultimately, the term used would depend on the specific region and the context of the conversation.