'Lowing' in the Bible

The cows took the straight way by the way to Beth Shemesh; they went along the highway, lowing as they went, and didn't turn aside to the right hand or to the left; and the lords of the Philistines went after them to the border of Beth Shemesh.

Samuel said, "Then what does this bleating of the sheep in my ears, and the lowing of the cattle which I hear mean?"