When a rabbit has GI stasis(gut slowdown) and could develop a potential blockage, a rabbits eating and pooping starts to slow down and will usually stop completely as the stasis progresses, which can then end up in a blockage occurring.
http://www.bio.miami.edu/hare/ileus.html
http://www.bio.miami.edu/hare/ileus.pdf
Just based on your description, to me it doesn't sound like your bun has stasis, but likely has something called cecal dysbiosis, if your bun is producing normal sized and consistency fecal poop along with the mushy cecals. If both kinds are mushy, then it could be bacterial enteritis or coccidiosis and you should get her to your vet immediately. If the fecal poop is smaller than usual, than it could be the start of stasis.
http://www.medirabbit.com/EN/GI_diseases/drop/Drp_en.htm
http://www.therabbithouse.com/diet/rabbit-droppings.asp
Cecal dysbiosis is where the microflora in the rabbits cecum becomes unbalanced, leading to mushy cecotropes sticking to the rabbits bottom. When not corrected this can further progress to more serious digestive illness such as bacterial enteritis. Cecal dysbiosis can be caused by stress, antibiotics, dental issues, arthritis, other underlying health issues, pathogenic bacteria or protozoa, but most commonly it is caused by an imbalance in the rabbits diet. Sometimes a rabbit can be sensitive to a particular food such as a certain veggie or hay, but most often it is caused by excess carbohydrates and sugars in the diet and/or not enough indigestible fiber.
http://rabbit.org/intermittent-soft-cecotropes-in-rabbits/
http://rabbit.org/disorders-of-the-cecum/
I can think of a few things that could be causing your buns problem. Fresh grass can sometimes be too rich if it is early growth, the pellet mix will have been high in carbohydrates, the alfalfa hay can sometimes cause digestive upset, too many carbs from the oat hay if it has mature seed heads in it, if you had started switching to the new food too quickly, or if your bun was eating too many pellets and not enough hay. Usually when cecal dysbiosis is due to a dietary cause, the best thing to do is an elimination diet, where you cut everything back to grass hay only until the dysbiosis clears, then gradually start adding things back in one at a time. If this is attempted, you have to make sure your bun is eating hay
well and that the hay is the right sort that will help and not contribute to the problem.
These are just steps that I would take in a similar situation, but when making diet changes for your own rabbit you should do your own research and consult a really good rabbit vet. I would be cutting the alfalfa hay and fresh grass out of the diet for now, as they can be a cause for mushy poop. I would hold off on introducing the new pellets for a short time until the mushy poop issue has cleared up, provided the bun is eating the hay really well to make up for no pellets, and then after it has been clear for several days to a week, gradually start reintroducing pellets slowly, over a couple weeks. Then I would feed only unlimited oat hay until the mushy poop has been cleared up for a few days, dependent on a few things. Is the hay all leafy green oat hay, a mix of leaf and stems, or is it mature oat hay with all or mostly mature stalks? Does it contain mature seed heads that still contain the oats? Does your bun eat her hay really well? Once the mushy poop has been cleared up for several days on a hay only diet, then I would gradually start adding things back into the diet one at a time, starting with pellets.
Another thing to seriously consider is whether or not there is a problem with pathogenic bacteria like e. coli or clostridium, or a protozoal infection from coccidia. These can be difficult to determine as a cause for mushy poop when there is only a mild infection or it's just starting out without more definitive signs, and if these are the cause of the mushy poop then it is a very serious condition that requires i
mmediate vet attention. Since it is difficult to determine if this is the cause, if you suspect this at all get your bun to a good rabbit vet right away and get her poop tested.
http://www.therabbithouse.com/diet/rabbit-digestive-system.asp
ray:
