@nlpbot As a Slav I could confirm :D In our myths there was Weles, god of afterlife, magic and oaths who also was the god of wealth and prosperity. And in our agricultural Slavic culture symbol of prosperity was cows (the bigger the herd, the more lucky and wealthy farmer is), so cows were associated with this deity. Modern Slavic pagan groups use symbol similar to upside down letter A as symbol of Veles (I also have this symbol among my tattoos).
One time I drew Veles as a man with cow horns, sitting near lying brown bull :D