My opinion,
High fat diets promote faster growth in young rabbits, as does higher protein content.
The takeaway is-- high protein levels in adult rabbit feed, "sometimes" causes issues,.. like bladder sludge
** before you get too concerned about cloudy, or colored urine - let me say some of this is completely normal..
The problematic signs are urine that "consistently"looks like thick milk, has a creamy consistency, or is like paste in bad cases.
[not enough water is also a big factor in cloudy or overly concentrated urine]
Too much fat in "non lactating" adult rabbits diet is problematic, as adult rabbits store internal fat readily .
Too much internal fat causes a wide range of health and breeding problems..
In my opinion, the foremost concern about Purina feeds is.. non standardised feed formulas,
IE: the feed content is constantly changing...
This sudden feed change, causes mysterious GI issues, that often instigate "off feed", loose stools, infections, and coccidiosis outbreaks.
Because "you" didn't change feeds, you are not looking this way, when you begin to see GI issues..
To remedy this concern, always buy feed before you run out, and mix some of the new feed
into the old feed, to create/insure a gradual feed change.
The other important thing to watch for [for any feed] is old feed -
[especially important in the summer, and in warm climates]
Always check the manufacturer date, on the label ..
Never buy a bag of feed missing the label..
any feed that has a manufacturer date, more than 2 months old is suspect,
[ smell it and make sure it still smells fresh,
and never feed anything with bugs on or in the bag, or dust coming out of it when you move it.[as this dust is often mold]
any feed that is 3 months old or older, is dangerous to feed to rabbits.
The fat in old feed is rancid.
Old feed,contains ever increasing levels of mold toxins, Rabbits are very intolerant of mold toxin.
Mold toxin is fatal in rabbits , with levels that are far less than ,what is dangerous for any other domestic animal.