Unfortunately, our beasts are inefficient animals, and they turn two-thirds of that into feces and heat, so we've lost those two, and we've only kept this one in meat and dairy products.
Purtroppo, gli animali sono inefficienti, e dissipano due terzi del nutrimento in feci e calore, per cui questi due li perdiamo, e ce ne resta solo uno in carne e latticini.