So yeah, there are a lot of things the developer has to fix.
1. The Intake (capture of slaves) the only get <gender> simply doesn't work.
2. The women shouldn't stop lactating if they're kept in the milking cage or kept breast feeding infants in the growing cage.
3. If slaughtering slaves is the only way of getting meat, then have the amount based on how fit the slave is. For this reason I only breast feed my slaves but as with the goblins it doesn't matter. Only the Goblinetts differ in this regard, they only yield 10 but it doesn't matter if you breast fed the Goblinette or not!
Also perhaps Beastkin and Harefolk should yield more food.
4. Slave women with large breasts should be able to produce more milk (it doesn't make sense IRL but...) as this would make the breeding x with y more interesting. As it's now I don't know what the offspring is based on. (I managed to get the Ogre)
5. The UI is a mess. I wonder how much the developer actually looked at this when they put this game together.
Text being over on top of each other, UI elements blocking x,y,z making things pretty much unreadable.
6. Camera angels are a joke. The wrongly named glory hole cage hasn't got enough camera slots as there are more slaves in that room than available cameras. Also when using the camera the rotating pivot is just awkward.
7. Selecting with dragging box could use more logic. I really like how you could drag and drop infants to the growing cage and if you have women "working" there they start breast feeding the infants. But when selecting a group of slaves I do not want to delete the rock(s) nearby!
When you get a few days in your burrow become a small city, with 100+ goblins and more than 4 filled slave cages(10 in each) this management game become unmanageable...
I put many hours into the game now and I can't continue further.
Good luck dev. on the next update.