Thank you for your suggestions.
I am in agreement with you re. whole veg being preferable to chopped veg. for the same reasons. However there has been a prolonged period down here when whole veg was not obtainable, apart from coarse leaves round cauliflower.
ETA When I had to cut grass in summer, I did so x3daily purely because of my concerns about yeast & fungal issues. (Somewhat neurotic I suspect)
I assumed that it was simply Thumper's dental issues & sluggish caecum, + the many factors, which can contribute to gut hypomotility which were the problem, until I heard of several people experiencing gut issues in their buns for the 1st. time ever, this winter. It was definitely linked to the place of purchase of the veg.
When Thumps refused to eat veg from 2 certain supermarkets, but would eat the same veg from a 3rd. I wondered about the washing of the veg. It also applied to whole veg surrounded by cellophane as soon as it became available.
I put up the thread to try to determine whether this was a local issue or whether it was more widespread.
Many of the affected buns do have dental issues, but their gut is kept well under control, under normal circumstances. Thumper's gut had been perfect for 12 months, with regular dentals, & a high fiber diet based on a wild rabbit diet.
Where symptoms have been described, the issues we have encountered appear to be bacterial/yeast overgrowth in the caecum, causing a sluggish lower bowel +/- gas. That only 1 rabbit may be affected out of several on the same diet, indicates to me that the affected bun has a slight predisposition to gut issues, which may not manifest except under extreem circumstances. Buns with this issue appear to crave fiber, before other symptoms become apparent.
Although we cannot do the research necessary to determine the cause of this, I felt that we could offer some helpful advice to others, on the basis of our own solutions.
ETA I accept that Thumper's keeping has been old fashioned. He has never had commercial treats, but only plants/grass & hay. Freedom to excercise x2 daily + free ranging indoors otherwise, has been similarly important. He has several health issues, which necessitate this approach foor good control,