I live in Wisconsin, have 11 birds (Buffs & Barred Rock), and a coop about 4 x 14 with an enclosed run that's 8 x 14. We're getting a lot of snow this winter so the girls aren't going into their run much. For easy cleaning, I built the coop with dairy board walls & floor and use pine bedding that I changed in late October and added to in early December. This morning I went out to get the eggs (BTW it's about zero) and I don't know if its the contrast between the crisp winter air or something else but man, I was taken back by an incredibly nasty stench when I opened the coop. Short of cleaning the entire coop, or opening up all the windows (neither of which are practical in the dead of winter). Does anyone have any ideas on how to 'freshen things up'? I read someone feeds their birds garlic but I also read that onions and garlic can flavor the eggs. Any ideas?