Can’t tell if this is pee- and if it is, if it’s healthy?

[Cryris]

Basically the title, but hey everybody- I just introduced my bonded females to another girl and it went pretty decently- however, my new girl suddenly coughed- and when she walked away this was under her. Now granted I think she only coughed because they were all eating lettuce- and might have been eating too fast. But her urine seems a bit gritty and murky to me but I wanted to get a second opinion- photo down below. They are now all sharing a separated cage and have been establishing dominance and what not- just wanted to mention the introduction part in case it somehow made a difference. Thanks again

 

[Siikibam]

If the urine is particularly gritty then you may need to review the diet. Excess calcium is expelled in urine. If it’s particularly gritty then that can be a sign there is a little too much in her diet. Water and pellets are the biggest contributor to the calcium in their diet. Hence it’s usually recommended that pellets are kept to one tablespoon a day (per piggy) and filtering the water. But do bear in mind that it takes a while for the lower calcium diet to kick in.

Bonding will not have affected her urine. I may have misunderstood your post though. Are they now living together or they are still separated? If they are together then ignore. If the latter and bonding went well then they need to be living together.

 

[Piggies&buns]

How old is the new piggy?
How long have you had her?
As Siikibam has said calcium is expelled in the urine but gritty urine can be a problem and will require a vet check (checking for sludge, stones) and a review of the diet if it is happening a lot.
So it depends how long you’ve had her for you to know whether this is not the first occurrence for her.

Rub the urine through your fingers, plus touch it again once it dries.
Normal calcium expulsion will leave a powdery residue but gritty urine will have a sand like texture.
The occasional normal powdery residue pee is fine and normal.
Urine that actually feels gritty and sandy is concerning.

They are not establishing dominance, a relationship or bonding if they are in a divided cage.
It’s fine to have them live next to each other for a few days before carrying out the neutral territory bonding though (a one time event) - they will be getting to know each other and their scents but in terms of achieving acceptance and forming the essential hierarchy, it won’t happen in a divided cage.
Bonding is a one time event where you put them together in neutral territory for several hours and leave them to go through the stages of a relationship. If all goes well in the bonding pen then they all move into their thoroughly cleaned out cage together to finish the process which takes around two weeks. They need to remain together from the very first time you put them together.
I’m not sure if you’ve introduced them to each other in a single space and then put them back each into a divided cage but doing this stops their bonding process.

Bonding and Interaction: Illustrated social behaviours and bonding dynamics