I confess that I drew this, not from life, but from a fuzzy old photograph taken by R, which we were going to throw away. It is a Chennai cow, anyway.
My father had several talents of interest to small children: he could wiggle his ears; he had a signet ring - we called it his magic ring - which he could make disappear; but most of all, he was really good at mooing. He was sparing in performing all of these wonders, so that they retained their desirability. But once in awhile we would say, "Make a moo, Daddy!" and he would oblige. It began with a long, deep "MMMMMMMM", and then extended out to "oooooooo", and it was very satisfactory indeed.