Why do you check the heart ? I have once seen a worm in a sheeps heart. That sheep was not thin but was below the condition of his paddock mates.
Other things have been inflamed intestines in pigs and a Chamois that was thin and had enlarged grainy lymph glands symptomatic of TB but MPI said 'inconclusive' when we delivered samples.
I have also identified Tularemia in Hares
Personally I think the best course is to start by only taking animals that are in obvious good health.
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