Something much softer and more absorbent, that you can change out regularly will work better, I expect. This is their bed, after all, yes?
I have about a foot of wood shavings on the floor of the duck house, then top that with a few inches of straw. I put a little fresh straw on top most mornings, then about every third day pull the straw out, fluff up the shavings, and replace with a small layer of straw.
What you get is clean, comfortable, healthy, and the used straw goes in the compost or on the garden.