Quote: The babies will sort this for themselves. The largest litter any rabbit of mine ever had was 14. I farmed some of the extras out on other does; I breed does in sets so I can do that if necessary
Apparently, rabbit does only produce a certain amount of milk, regardless of the litter size. I read about a study that found that the litter as a whole gains the same amount of weight, regardless of the number of kits in the litter. Kits that are born in numerically small litters grow faster than those born in large litters until they get to the age where they start eating solid food. Based on this information, the general opinion was that the optimum size of the litter is about 6.
It may sound heartless, but IME, most bunnies that are significantly smaller than their littermates are smaller for a reason. You may expend an awful lot of energy on a runt, just to have it die anyway. I'd just leave them together. With only 9, any bunny that can't compete probably won't make it anyway.