I have noticed that last 4 times I have cleaned out my duck barn that there has been a VERY strong Ammonia smell. I have never smelled this before. I have had ducks for 4 years now. I have 16 Adults and 14 older babies right now in my Barn. I also have a adult guinea and 6 baby guineas. I have had the guineas for a year now and had all together 10 last year and never smelt it. I have closed in my Barn earlier this Spring because we had a VERY bad owl problem. They killed 7 of my ducks and 1 guinea. So I have closed off 3 sides and going to finish off the 4th side before winter. Maybe not enough ventilation? I need help. Its hard to catch my breath in the barn and i can't imagine what it is like for the ducks. PLEASE can someone tell me what to do. I have limed and everything and It doesn't seem to go away. Thanks in advance!