It seems to me this combo is really strong for xenophobes:
The agrarian trait doesn't increase food yield from livestock, but any trait that improves output by "workers" or "jobs" will. This means strong/very strong pops make good food, as do serviles and proles. Once you have genetic ascension, robust pops and nerve staples pops will produce more food as well.
*As the game wears on the stability of the planet will drop, as even the low political influence of the slaves will begin to lower your approval rating on the planet. The best solution to this is nerve staples, and of course once you can nerve staple them you can also make them delicious, at which point your food surplus grows to the point where you can dump your excess food on the market, effectively giving you energy income as well.
- Invade Primitive World in the first few years of the game
- Set the natives to "Livestock"
- Manually delete their primitive capitol building so your shelter gets built (This is a bug: it's supposed to happen automatically). Upgrade it.
- Shift a few of your pops over there to run things, filling the ruler/enforcer jobs
- When you have the Thrall Worlds tech, turn the planet into a Thrall World
- Enjoy having free food forever*.
The agrarian trait doesn't increase food yield from livestock, but any trait that improves output by "workers" or "jobs" will. This means strong/very strong pops make good food, as do serviles and proles. Once you have genetic ascension, robust pops and nerve staples pops will produce more food as well.
*As the game wears on the stability of the planet will drop, as even the low political influence of the slaves will begin to lower your approval rating on the planet. The best solution to this is nerve staples, and of course once you can nerve staple them you can also make them delicious, at which point your food surplus grows to the point where you can dump your excess food on the market, effectively giving you energy income as well.