horse manure and cow manure are
riddled with weed seed so when ya do that,
your basically planting your garden with
weed seeds
they go right thru their digestion system and are still viable
i found this out ....the hard way.... 
over time
every square centimeter had a weed...and it was so damned thick
you might as well throw in the towel.. right then and there...
now, if you trench compost it... meaning, you dig a pit and have it a foot lower
that your top soil then
maybe just maybe you can get away with it...but,
i'd only do it if i was spiking it with red worms. i certainly don't trust it to be
"
weed free"...
thats for SURE!
"human compost" on the other hand that has been ultimately processed
and
sterilized (certified safe)
has no weed seeds in it -> at all...