Topic accelerated from Pasture to agricultural revolution to industrial revolution pretty quickly.

Since pasture can be expanded to future civs as well, I’ll save pasture bonuses for them. I don’t mind existing civs also getting Pasture but that requires another change on the building.
My suggestion would be -
Tanguts = Herders work faster.
Hephthalites = Pasture techs are free.
Gokturks = Pasture is cheaper.
If you want to stretch, you can get even more bonuses like -
- Pasture techs are more effective.
- Herders generate gold.
- Pasture lasts longer. (Already works for Tatars)
- Pasture animals have more food.