your boiling of the substrate was way too little - the center of the
manure never got up to boiling temps. To grow mushrooms outside, you
need a mushroom "spawn". It is much more hit and miss with the spawn
than with the indoor kits. If you want to grow them in logs, then you
buy "plugs". Oysters will grow on the widest variety of substrates, in
fact they will grow an on anything organic. find all you need
(including instructions that you should follow carefully) at
www.fungi.com.