I have a friend that has a horse and cow, so I can get manure by the truck load. This manure has not been composted in a pile...just laying in the pasture. It’s pretty obvious which manure is aged. Can I just scoop this up and use it or do I need to find manure that has been composted correctly? If this manure is okay how do i know which patty is aged enough...can it be too old?