> But I don't find the word "trave" in english dictionnary

https://www.lexico.com/definition/trave

That's what it's actually called, especially in an historical context. A cattle crush to me suggests a different type of structure and I would definitely not go with Wikipedia as a reference lest we end up calling it a “portmanteau”. ☺

As always, rural trade terminology is subject to heavy regional variation – it's the same in French, where these are known as « entraves » in Auvergne, but travail, congrelh (Occitan) or ferrador (also Occitan, pronounced ferradou) elsewhere in France.

I would stick with “trave” for the historical artefact.
