I've heard that there is a strong similarity between the ways different cultures call their cattle to water. My Dad always called "Soooo-Cow" (sounds like "Sue"). Also when moving cows from one field to another, we'd call "hie-on little calvies", "hie" is an archaic word for "go" that we never used in other situations.

Whenever I sang in the presence of cattle, they stopped dead and looked at me for as long as I would sing. Stopped even chewing their cud. Guess they thought I was crazy.