Delicious In Dungeon / Danjon Meshi - guess they are good for something after all

actually a brilliant idea: Sterilized goblins could compete with the actual fertile goblins for resources without having any way to create more goblins.

And general insects. It's brutally effective there.

If you want to disrupt or exterminate a species, there are two major means:

1) Disrupt the food supply
2) Disrupt breeding