Yup, looks like a vertebrae of a BIG animal.
BTW would you please post a picture of an artist’s rendering or a picture of a skeleton of an Auroch?
The Auroch looked similar to a longhorn, but was bigger and broader. The last known specimen died in the 1700s in Poland, not that long ago, and mind boggling to think that it was hunted, and then herded, in the last ice age.