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ethos seems to have a handle on it. AsureQuality look after meat inspection in NZ. Pre 98 it was MAF, now known as MPI. @
Moa Hunter that's a tricky one to advise on. Basically you just want to keep an eye out for anything abnormal, which doesn't always mean you have to throw the whole thing out though either. Back in the works you'd see lots of stuff that just gets trimmed off/out and passed for export.
I could rabbit on about all sorts of pathology but you might never see it in your lifetime of gathering in the field. The prevalence of condemnable diseases isn't that high.
I like to keep an eye on the heart liver gastrointestinal intestinal tract and kidneys. Any cysts and they're out, the offal that is. Liver for enlarged bile ducts or gravel in the ducts, a definite sign of liver fluke.
Having trouble deciding how much to waffle on about but I think as general rule if there's something major that's going to affect you then you'll know it when you see it.