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ANY manure that is not composted will still have live weed seeds in the mix. The compost pile should have an internal temperature high enough to kill any weed seed in it. From time to time it needs to be turned so that the stuff on the outside gets a chance to be heated up too. If you are doing it right, when you dig into the center, it should probably be hot enough to steam. A little moistening to aid in the decomposition combined with heat from the sun should raise the internal temps enough to eliminate the seeds.