Sorry but I'm a bit of a crusader against giving bunnies any dairy products. You will see much advice (not on this site) telling to give yoghurt to buns that may be experiencing stasis. It is one of those folksy type remedies that falsely enters the rabbit care debate, probably in the belief that it will restore gut flora.
Two of the major bacteria in yoghurt and some probiotics are lactobacillus and acidobacillus. These have been found in studies not to naturally exist in the stomach, intestines or caecum of rabbits. Gouet and Fonty stated in their 1979 research: "The rabbit digestive tract never harboured any Lactobacilli."¹
Lactobacillus and acidobacillus pass directly through the stomach and gastrointestinal system without colonising, then on to the anaerobic atmosphere of the caecum where they cannot survive. This may give the impression that it it is doing neither good nor harm. However, the milk product (in this case yoghurt) that contain these bacteria cannot be digested without their presence, leading to the rabbit being subjected to an increased risk of G.I. tract trauma.
¹ Changes in the digestive microflora of holoxenic rabbits from birth until adulthood
Ph. GOUET, G. FONTY, 1979
Laboratoire de Microbiologie, L.N.R.A.,
Theix, Saint-Genès-Chompanelle, 63110 Beaumont, France.