'Lowing' in the Bible

And the kine took the straight way to the way of Bethshemesh, and went along the highway, lowing as they went, and turned not aside to the right hand or to the left; and the lords of the Philistines went after them unto the border of Bethshemesh.

And Samuel said, What meaneth then this bleating of the sheep in mine ears, and the lowing of the oxen which I hear?