From the thread that is pinned at the top of the rabbitry section:
Between the 14th day and two months, you may notice anincrease in mortality. The vast majority of deaths in these youngrabbits is related to their intestines. For some reason, they are verysusceptible to inflammation of their intestines and they may or may notget diarrhea, and simply die for no apparent reason. Many rabbitraisers put Terramycin in their drinking water for two weeks, startingthe 14th day, in order to curb the alarming death rate. It is met withsome success, but, unfortunately, enteritis, as it is called, is a bigkiller. It's also a big killer of cattle and pigs at the same age. Inthem it is called scours. They are treated in the same way as rabbits.I think the reason for intestinal disease at this age is the changefrom milk to solid food. The intestines become somewhat allergic to thenew foods it is processing and sets up a reaction that can lead todiarrhea or constipation, in any case, causing intestinal inflamation.Terramycin helps by keeping bacterial build up from killing its host. Ibelieve there needs to be more research in this area.
I do lose some - but not many. I just watch for diaherrea and try to push hay and oatmeal.
Peg