OK, my vet told me to feed my boys half a cup a day of pellets (between the both of them, quarter cup each). Well I feed them every night before bed and its gone before noon the next day. They always root around the food bowl like they are starving. As to other things in their diet, never ending hay, the occasional few pieces of apple, parsley and cilantro. I have tried lots of other fruits and veggies, but they have only taken to apples. I get the pellets off of smallpetselect.com. It is healthy timothy based food with vit.C. I want to trust that the vet is right, but it is hard to see them acting so hungry. Every time I stand up and move across the room, one or both of them wheeks at me. So are they really hungry--or do they have a strong appetite? Side note- they are both 7 months of age.
At 7 months they are adults, so no more than 1/8 c pellets a day. If you are seeing white spots in their urine, then you need to cut out parsley and maybe cilantro too since it's connected with excess calcium secretion even though it's not high in calcium. You can forget about fruits no problem as it's all sugar. I don't give mine any. If you do, only small amount 1-2 x a week is all.
I give my girl a salad am and pm. I have some white spot issues from time to time so low calcium/no calcium veggies:
AM: green leaf lettuce (romaine has been connected to excess calcium as well), radicchio, 1/4 green pepper (very important for vitamin C even if the pellets have it)
PM: green leaf lettuce, 1/4 red roma tomato, 1 small baby carrot, belgium endive.
You should encourage at least the green or red leaf lettuce and green pepper.
Pigs will always act hungry especially for sugars like fruits. Check out the nutritional chart pinned here. If they really are hungry, they do have hay to eat between feedings and if the pellets are gone for the day.
Also if you have calcium issues with your pig(s) then switch them to KMS. KMS doesn't use limestone as calcium like all other pellets do and has helped or fixed the excess calcium excretion in many pigs.