Jun 9, 2006 · Horse Manure Production: Horse manure production is variable and depends on horse physiology, horse management, and manure collection practices. A 1000 pound (lb) horse produces 31 lb of feces and 2.4 gal. of urine, which adds up to 51 lb/day. The amount of feces and urine ranges between 42 and 68 lb/day for 900–1300 lb horses.