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Sludge wees

Piggies2023

Teenage Guinea Pig
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I can't get my head round the info on here about sludge wees being caused by too low calcium? How would that work? Why would the body wee out more? I am having problems with my piggie Fonzie but I am sure his diet isn't too high in calcium
 
Where does that information come from? Like why would that happen? I don't understand why it would cause it and this is the only place I have read it.

He has meadow hay, timothy hay all the time. Morning he has cucumber, pepper, romaine lettuce. No diet variety due to his cage mate with issues and rescue said those veg are fine. Pellet wise he was having about 1-2 tablespoons of science selective- wasn't grain free version. But even that confuses me. The grain free one on the packet says it can be anywhere from 0.4-1 % calcium so they can't promise its low. And the grain one says 0.6-1.1 % so grain free is only mildly better. So confused why grain free is normally said to be one of the best?

Piggie parcels is seen good as it has good ingredients but it says 0.8% so isn't low either. Tried giving him some of those instead of science selective but only a teaspoon of them and he still made one squeak today which I am pretty sure was when weeing

He is having a few wees like this a week where he squeaks and it is clear its sludge
 
It is to do with the way the body tries to reabsorb calcium if intake is too low but as it is too low the kidneys essentially can’t cope and cause more loss of calcium.
The information is available online

Grain free pellets is about it not containing grains (which piggies shouldn’t eat) rather than entirely calcium content.
All pellets contain a lot of calcium, more calcium than the highest calcium veg (which is kale) - that is why they should never have more than one tablespoon per pig.
I personally don’t feed pellets and instead do feed high calcium veg. We have achieved a balance and don’t see calcium pees
 
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