Though a formula for actual authentic bullshit would be pretty complicated. It would depend on the breed of your bull, its diet, its purpose, its locale. It would be a lot easier probably to buy a bull and a barn and a pasture and just make the real thing in real time on the spot. Ironically, your bullshit would then no longer be bullshit--it would be the real thing. It would be certifiable. As I always say, "Give a man a formula for bullshit and he will look at you incredulously, but buy him a bull, a barn and a pasture and he will be up to his knees is bullshit for the rest of his life." Well, for the rest of the bull's life anyway. Why mess around?