For those intent on dehydrating ground beef or turkey I would caution them on having a dehydrator that can attain the optimum temperature for ground meats (I believe it's 170F.)

I have a dehydrator my mother gave me and it has some unspecified single temperature setting.  I fried up some ground beef, drained, and thoroughly rinsed it in copious amounts of boiling water.  I dehydrated it to the consistency of gravel.

On two instances (out of three uses) people got mildly ill after ingesting this ground beef.