We have just made it through our 1st winter using the deep litter method ( worked VERY well) now that it's warmer I need to switch the bedding out, I had sand last yr witch worked very well also BUT this year we are adding ducks to our flock & using sand is not a good thing being that they bed on the floor & not on a roost....so any suggestions?? Hay? Straw? Pine shavings? How do you maintain it daily to keep from smell & flies??