I don’t think soy hulls etc are to be considered fillers when it’s in bunny food, bunnies depend on getting lots of fiber. They should eat lots of food that has a low energy content, like horses. Wild rabbits kind of graze all day long, it takes them a long time to gather all the nutrients they need to sustain themselves on their natural food, grass, and that’s why rich food is bad for them. It’s kind of like the opposite to how and what a dog or other carnivore should eat.
From what I read, heat-treated soy bean hulls has lots of digestible fiber. Digestible fibers are also called soluble fibers and is very good for the intestines. The very highly recommended Oxbow Essential Adult Rabbit food lists these three ingredients first: Timothy Grass Meal, Soybean Hulls, Wheat Middlings.
So I wouldn’t worry about soy hulls and wheat middlings.
I didn’t mean to bash VitaKraft Sun Basic pellets. I looked it up, http://www.sunseed.com/product/rabbit/sunBasicsRabbit.html
It seems ok, and if it’s the highest fiber-option you can get, and she eats it, I’d stick with it.
ZuPreem sounds good, timothy is supposedly better for adult buns than alfalfa. It is less yummy though so maybe Moshu wouldn’t eat it and if a bunny won’t eat, it doesn’t really matter how high quality the food you serve is =/
The idea of rabbits in diapers is crazy here too =) If I tried sth like that on Bam or Yohio they’d be so angry!!