Why poultry farms are located close to cities and towns?

In the days when there were few good roads and transportation was by farm wagon, it was necessary for poultry farms to be close to cities and towns so that eggs and other poultry products could be delivered quickly while still fresh. It was also more convenient for the poultry farm to be close to town for obtaining the poultry feed. Many present-day poultry farms were established long ago and the farms are still run by the same families.