I just have a few questions. When you increased their pellet amounts, did you do it gradually or suddenly? And when they first leave their cecotropes behind(before they are stepped on or smooshed into anything) are they fully formed, semiformed, or unformed? Have you noticed if both rabbits are leaving them behind or just one? Do you feed any other sugary starchy treats, or any veggies and were they suddenly introduced into the diet or gradually? How much hay do you think they are both eating in a day(small, large, x large handful 1 or 2 times a day) and about how much of the pellets are they both eating each day? Also do you know their weight?
http://www.therabbithouse.com/diet/rabbit-droppings.asp
Okay let's see.
1. The rabbits were getting a 1 cup scoop a few times a day, when we saw that they were "supposed" to get unlimited pellets, we just kept filling up their bowl with 1 cup scoops everytime we saw it was empty.
2. They've had nothing at all to eat except the pellet food and hay - they were given a little piece of romaine lettuce to try when they were very young (because we didn't know that was too early) and they haven't received it since.
3. Cecals are fully formed and normal.
4. We don't know who is leaving them - definitely Wally, as he sometimes has bits stuck to his tummy, but they live together and we aren't always home to watch and see who's leaving the poops. They're pretty inseparable right now, needing to always be where the other is, so I can't say if it's one or both.
5. Amounts of hay are unknown as well - we give them copious amounts in the litter box, which they nibble on all day, and they have a kleenex box stuffed with alfalfa which they play with and nibble on. I just keep adding more, as it gets soiled / flattened / tossed / eaten.
6. Pellets are devoured the moment they go in the bowl - total enthusiasm for the pellet food - it's basically their most favourite thing ever, which makes me feel like I don't feed them enough or something. They're always hungry!
7. 2 weeks ago, the vet weighed them at 3.7lbs (6 weeks old), they are now 8.5 weeks, and probably closer to 5lbs each. I can weigh them later and see exactly, but 5lbs is my estimate.