YOU SAID:

My cow is black and white most of the time.

INTO JAPANESE

私の牛はほとんどの場合黒と白です。

BACK INTO ENGLISH

My calves are black and white in most cases.

INTO JAPANESE

私のふくらはぎは、ほとんどの場合黒と白です。

BACK INTO ENGLISH

My calves are black and white in most cases.