Production Methods
The physiological basis of foie gras production is migratory birds' capacity for weight gain, particularly in the liver, in preparation for migration. Toulouse geese and Mulard ducks are the most commonly used breeds for foie gras. Mulards are a cross breed between a male Muscovy Duck and a female Pekin duck, and are estimated to account for about 35% of all foie gras consumed in the US. Typical foie gras production involves force-feeding birds more food than they would eat in the wild, and much more than they would voluntarily eat domestically. The feed, usually corn boiled with fat (to facilitate ingestion), deposits large amounts of fat in the liver, thereby producing the buttery consistency sought by the gastronome.
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