[aqh88]

You also need to take into account more than just pig odor. Some bedding has an odor. My boyfriend and I absolutely cannot stand the smell of pine. It makes us sick. I quite liked the earthy smell of wheat based bedding while my boyfriend said it stank horribly. I've written reviews on bedding before and found it very hard to fit all of them neatly into categories. Plus everyone's opinion is different. Compared to wood shavings and wood pellets I'd give hay an A C rating. It has zero absorbency and actually keeps moisture from drying. Maybe it needs a negative rating. The cage would probably be drier after having no bedding than having a layer of hay. It's also 10 times the cleaning work and most droppings or urine make it to the coroplast to leave stains.