Sorry to hear about what has happened. It must be heartbreaking.
Unfortunately no-one on here is realistically going to be able to help with a diagnosis if the vets doing the autopsy cant determine the cause of death.
The finger does seem to point at the grains in some way though.
I assumed that Tommy is not asking anyone here to do a post mortem, but merely asking if anyone on the forum has had a similar experience. Seemed a fair enough avenue to explore, seeing as the vets don't have the answer.
So a vet, who has seen the animals, carried out a post-mortem exam and has full access to laboratory testing facilities does not know the answer, so lets see if anyone on a small online smallholding forum has direct experience of 9 pigs dying in 24hours.
I stand corrected....
If the initial question was "I have had 9 pigs die, what do you think they died of?" then your answer would be sensible. However, that wasn't the question and the post was perfectly reasonable. Not everyone on here is a smallholder, some have or work on larger units and there are vets. There will be smallholders who have experienced greater than normal losses too. To ask for help, experiences and advice is what a forum is about, is it not? To expect it to be a substitute for a vet it certainly shouldn't be but that isn't what this post was for.
I am not sure why you and LRR seem to have taken offence to what I have said.
I realise the OP was not asking for a post mortem, but it was quoted as though that was what I had said.
I am also aware what the OP was asking for with their post, as I had read it. Despite that it was implied that I thought it was unreasonable for them to seek the opinion of others. At no point did I say it was a bad idea to post the original question, I was defending the basis of my reply as I had been misquoted.
Forums like this are exactly for asking this sort of question. The point I was trying to make (and clearly did a poor job of making), was that whatever peoples opinion on here may be, whether a smallholder, vet, farm hand, stockman or whatever, it will only ever be an opinion. It will never be as well informed as the vet who has seen the actual animals in question. That is my opinion and I remain of that opinion. That may not be your opinion, but it is mine.
Of course the OP can ask for further advice and I have never said that should not do just that, but it will only ever be speculation and opinion, not a diagnosis - as I said in my original reply above.
Blimey, I now understand why many of the newer members of this forum stop posting after a short while, as I feel like I am being verbally attacked by a lynch mob. If you re-read my original reply, I would like to hope that you can see that it was well-intentioned.