I only post this because of the mention of milk thistle to cure "sloppy poos"
My understanding is that if birds are given 'unlimited quantities' of fresh fruit and veg that you will rarely ever see the neat little white and green dollop poos.
The fruit and veg will lead to a hugely increased number of intermediary wee based poos....so instead of the neat ones you get billions of watery/green poos....is this what is meant by sloppy poos? (the structure of the green in the watery poo is quite solid)