What is the most important thing on Thanksgiving Day - a worldwide family holiday? If turkey comes first to your mind, then you think in the right way. But do you know why turkey is so a significant part of this holiday? At the time, when this tradition had begun, there were a lot of turkeys all over America, they were raised only for their meat because they don't produce milk or eggs, and one turkey was big enough to feed a whole family. Delicious turkey as a Thanksgiving Day Holiday cursor.