Is "Bielowicza" in Poland?

I know there are Wisent in Eastern Poland.

My ancestors came from East Brandenburg in 1836-8 and I found interesting to see a Wisent trophy in one of the Hapsburg's castles with the location "Mezeritz" 1836. Mezeritz is a town a few kilometres to the North. Today these areas are part of Western Poland.

So it appears Wisent were there, perhaps a semi tame herd (?) in the 1830's.