Gassing up can have very different causes in rabbits
A common cause of malfermentation and excessive gas production is feeding errors: spoiled feed, excessively large rations after feed deprivation (stomach overload), a sudden change of feed or commercially available dry feed. Rabbits should always be given access to roughage or fresh feed to ensure normal intestinal activity. Feeding commercial dry food, which mainly contains grain, can increase the risk of increased gas formation. Due to its composition, dry food slows down the time it takes for food to pass through the intestinal tract. When fed together with fresh food, the fresh food remains in the intestinal tract longer than usual and there is a risk of increased gas formation due to the fresh food. Another cause could be a parasitic infection with worms or coccidia (protozoa). A fecal examination by a veterinarian can give you quick results and provide important clues about the composition of the intestinal flora. Excessive colonization with yeasts can also cause digestive disorders with flatulence and diarrhea.