Spreading horse manure on pastures being grazed by horses is not a recommended practice. However, horse manure that has been properly composted for a period of 30 days may be spread on pastures. The heat generated during composting kills internal parasite eggs and larvae. It is important to compost properly. Infective larvae of strongyles (blood-worms) have been known to survive up to eight months in hay harvested from pastures fertilized with infected horse manure. Cattle manure spread on horse pastures should create few problems as there is only one species of internal parasite (Trichostronglus axei) that horses and cattle can share. Poultry litter is routinely spread on horse pastures. The biggest problem with poultry litter is the weed infestation that occurs due to weed seed found in poultry manure.
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