Could the disease that caused that pig to collapse affect the quality of the meat? I'd want to ensure that I'd get good meat out of every hog, provided the veterinary work didn't cost more than my profit margin.

There wouldn't have been anything to get out of dead jews. Supposedly they didn't even know what to do with all the bodies, so they wouldn't have cared about the quality of the cadavers. If one collapsed, she could bypass the gas chamber and go straight to the oven.