Zarithar
Hero
Oh I see what you mean.
A cow and an Ox are raised differently (an Ox being more of a Beast of burdern than Dairy cows and meat cattle), while the Stench Kow is a classic D&D monster. The Rothe appears to be the Forgotten Realms Equivalent to a "giant" cow.
Gender is the only difference between a cow and an ox. Rothe are actually (as they appeared in the Fiend Folio) more like pygmy musk ox than cattle... but still, if they were going to go with bovine overload, why not give us some minotaur variants instead?