Bumping this as there's still no auto-slaughter button when Numbers takes over the menu.

yeap, there was a mod on 1.4 but it aint updated

The mod that adds a button to the main bar still works, thankfully, but it's surprising that this mod hasn't addressed it yet. Auto-slaughter is kinda important.

I also came across this issue. A work-around is deselecting numbers for the animal tab menu, but you might need to reload the save file for it to change.

I wound up turning off the mod for the animals tab because it essentially removes auto-slaughter by removing the way to access it. I don't want to add another mod to add the button back when I can just turn off the option for it in this mod. But still wished it was updated.