There are very few "wild" deep rothé herds left in the Underdark; they've been captured and are now the carefully-farmed exclusive food larders of particular communities. So they've disappeared from "general Underdark" larders and tables.
Cities with those herds, yes!
#realmslore
Quote
Stacey Reilander Art
@morgalahan
Replying to @TheEdVerse
Not deep rothe? I'm sure I read mention of rothe in the Underdark in some of the AD&D era Forgotten Realms novels I loved as a teen.