thumps_, have you found it to be a local issue? I know the freshness of veg in supermarkets often depends on the distance from distribution centres, etc (e.g. when we only had one Waitrose in the area, the fresh fruit and veg from there was not good at all).
I have 24 rabbits here ranging in age from less than 1 year to more than 12 years old...so quite a good 'test group' for trialling foods...so if anybody has any doubts about the veg from a particular supermarket, I'm happy to try it out on my bunch :wave:
Abbymarysmokey, I may have misunderstood you, but took this comment to mean that you would try your own buns on veg from supermarkets which seemed to be implicated with GI issues in some buns. My response to this, is to advise stongly against doing so, in view of the fact that some buns seem to have prolonged illness with caecal dysfunction. As you say it may be a transport issue.
A simple comparison of bacterial /yeast/fungal types & counts across the brands, is what would be required,+ details of source & preparation methods.