The subject of intentional breeding or meat rabbits is prohibited. The answers provided on this board are for general guideline purposes only. The information is not intended to diagnose or treat your pet. It is your responsibility to assess the information being given and seek professional advice/second opinion from your veterinarian and/or qualified behaviorist.
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I've first noticed it a few days ago when Gracie peed on the laminent floor that there's some calcium in her urine. Today I noticed a dried pee spot in their cage that had some calcium spots that were dried up. I'm trying to cut back on their pellets a little and they've been eating orchard hay. I'm making an appt. for the vets to get her bum shaved on Monday anyways but I thought I'd get some suggestions since the vet isn't open on the weekends as to what I can do to help her.
Has she had any change in her diet recently? Like Jersey said it is normal for bunnies to excrete out some extra calcium, but I think it's something you have to watch if it becomes consistent and/or thickens.
Having a bunny, like Jack, who does have problems with how his body processes calcium, has made me more aware of how much is too much. He was always one ot have some calcium excretion,---not much but then as he aged, it became a serious problem for him, and he developed a bladder stone, and now if he doesn't drink enough water, his urine gets thicker (when it dries, it actually turns to powder) and he can also get thick sludge if I don't manage it properly with fluids I would rather see sludge than have it build up to a stone, but sludge can scar and irritate the bladder so that's not good either. (So I just am careful to make sure that if he doesn't drink enough water, then I give him sub-q fluids).
It would be nice though to have a solid answer with photos of what would be considered "normal healthy calcium excretion" in comparison to something that would be considered a health issue, so people can feel more confident about whether it's a real problem or not for their bunny. (hmmmm.....something to work on. Great to research and talk to my vet about )
I might also suggest you read this answer about sludge/calcium in rabbits diet recently posted by Dana Krempels on April 1, 2011: