Actually, we use the poop of almost any ungulate. Cows, sheep, water buffalos etc. We use that because their poop is rich in nitrogen and phosphorus compounds. They are also thick, and good at holding water. Carnivore and omnivore poop, on the other hand tend to be higher in protein, and much lower in things that plants need. They also tend to be packed with parasites and bacteria that are easily transmissible to humans.
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