Ground beef already formed into patties or separated into smaller quantities take less time and defrost quicker. For instance, 1/2-inch (1.25-cm) ground beef patties that were frozen separately usually take about 10 hours to defrost.
Gelatin is a protein substance used to thicken liquids. It does not have a color, smell, or taste. It comes from boiling animal tissues such as beef bones, cartilage, tendons, and pig skin. Gelatin is used in many kinds of food products and drug and supplement products.
Thanks for the answer request. I'm not a vet so i don't really know. My guess is that what you're smelling are sulphurous compounds associated with garlic and onions. Perhaps review what your donkey is eating. Some vegetables such as cabbage and other Brassicas can cause gas and sulphurous smells in humans, perhaps donkeys too.