The first known records of livestock transportation occurred in about 1607 on an English ship named the Susan Constant, which was transporting Jamestown bound colonists. As time passed and the New World developed, supply ships from England carried livestock as regular cargo. Purebred stock was imported to Plymouth and Philadelphia in the USA. By about 1700, the exports of cattle and packed meat regularly left the port of Philadelphia which was bound for the West Indies. Livestock fatalities during sea shipments would often be 50% or more, which was attributed to poor feed supply, overcrowding, and rough seas.