Hiya Barrett,
The commonly accepted formula is 1 pound of food for each month of age, up to a maximum for 6 pounds per pig, per day (normally split into 2 or 3 feeds) though not for smaller breeds such as Kune Kune's.
6 pounds = 2.7 Kg
Another good guide is as much as your pigs can eat in 15-20 minutes, if what you're giving is gone within 10 minutes, probably up it a bit or if they take longer reduce it a bit.
There's no absolute 'right' amount to feed as it depends on the pigs (boars are lazy and tend to lie around while gilts are always moving and burn it off quicker) the amount and type of land they are on (big areas with grazing/rooting potential) and the weather (will need more to keep warm/maintain condition in the cold) so you may have to adjust it slightly depending on your set-up. We use an old SMA baby milk tin as a measure - they hold 3 pounds of the feed we use, so it's an easy way to measure.
The best rule of thumb I was given is - if you can see the backbone, they are too thin and if you can't just feel the ribs, they're too fat. Just watch your pigs and make adjustments as neccessary.
HTH
Karen