WOW - I found it. First of all, this book is Raising Rabbits and it was written in 1977....so maybe they've found out more things since then.However...here is what I read - pages 115 & 116.
Nutritional Deficiencies:
Nutritional stresses are harder to correct than those brought on by weather and noise. Inadequacies in the day-to-day diet of the herd can crop up in some of the strangest ways. One of these problems appears to affect only very young rabbits, though the actual deficiency is experienced by the mother doe. The doe herself won't normally show any outward symptoms, except that she may be somewhat thinner than usual.The tiny babies, somewhere between a few days and several weeks old but still relying mainly on the doe's milk for nourishment, develop tiny bumps or pus pockets. These tiny pustules most commonly are noticed on the necks and bellies of the little rabbits. When the babies are a bit older, already furred out, the first indication of any problems may show up in white scaly-looking material around their noses (simular in appearance to dry, flaky dandruff). The fur around the noses may shed, leaving only bare but scaly, snowy white patches on either side of the nostrils.
When this problem appears in young bunnies, the mother doe is carrying a nutrition-deficiency disease germ called Pasturella. This disease is contagious through direct contact between rabbits, so those affected should be isolated. The doe and her litter may be kept together and medicated to correct the problem.
Vitamin therapy on a daily basis is the only cure for this type of Pasturella. Even if the young are still nestlines, not yet eating solid food or drinking water, vitamins given to the doe will benefit the young as well. The vitamins should be administered through the doe's drinking water.
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That is all it says about this particular type of Pasturella. It goes on to talk about caked breasts in the doe, etc.
The next page talks about Vitamin E being important.
AS I stated in the beginning, this informationis 30 years old. Perhaps someone can add more updated information!!!