Adam Clarke on Exodus 29:22

The fat and the rump - The rump or tail of some of the eastern sheep is the best part of the animal, and is counted a great delicacy. They are also very large, some of them weighing from twelve to forty pounds' weight; "so that the owners," says Mr. Ludolf, in his History of Ethiopia, "are obliged to tie a little cart behind them, whereon they put the tail of the sheep, as well for the convenience of carriage, and to ease the poor creature, as to preserve the wool from dirt, and the tail from being torn among the bushes and stones." An engraving of this kind of sheep, his tall, cart, etc., may be seen at p. 53 of the above work.