I am new to this, but I have used rice hulls in the garden one year, and don't do it. I attracted every bug in a 20 mile radius. Which I realize chickens like bugs, but I don't know if you would not end up with the wrong type of bugs.
Rice hulls are used in most commercial chicken houses because the are highly absorbent and are non-toxic. They are arguably the best bedding, (some studies indicate that peanut shells are absorb uratic acid better thus controlling odor better).
If I could find a cheap source , I would switch.
you can research this on pubmed.gov and most Agricultural Universities.