Is there calcium carbonate CaCO4 in hog manure?

Well, honey, it seems like you got your chemical formulas mixed up. Calcium carbonate is actually CaCO3, not CaCO4. And to answer your question, yes, hog manure can contain calcium carbonate in the form of limestone or other mineral sources that the hogs consume. But next time, double-check those formulas before you come at me with that sass!