While I am well aware that parasitic worms are endemic in most animals I have never encountered any while doing the gralloch on deer. But than of-course we always aim to remove the entire intestinal track intact so even if there would be worms in there we'll never see them.
I neck-shot a young Roe buck, spiker, yesterday evening, (entry lower neck, exit front of chest. heart/lung) and on gralloching found that the intestines had ruptured and the contamination on the gralloch showed a few very thread-thin approx. 1" long worms crawling around. The animal seemed otherwise 100% fit and healthy.
The shot should not have ruptured the intestines but on occasions maybe the hydrostatic shock does. Or possibly a bone/bullet fragment bouncing around internally.
I am interested in any comments re. intestinal parasitic worms found in/on the gralloch, thank you.