the Domestic Donkey was Used for Bearing Burdens
Source: TTT
Genesis 42:26
and they loaded the grain on their donkeys and departed.
1 Samuel 25:18
Then Abigail hurried and took two hundred loaves of bread, two skins of wine, five butchered sheep, five seahs of roasted grain, a hundred clusters of raisins, and two hundred cakes of figs. She loaded them on donkeys