In those days flocks were not plentiful, and living creatures were rarely killed for eating. Except for herbs men had nought to eat and it was the ground that produced all, until Ahriman, the Evil-doer, conceived and lodged in the minds of men the thought of killing animals. Out of every genus both of birds and quadrupes he contrived eatables, making use of all. With their blood he fed Zahdak, as though it were milk, in order to make him stout of heart.
Shanameh III.ii (Levy’s translation p. 7)