Protection from rodents requires rodenticides and protective equipment to prevent rodents from entering the crop store. In developed agricultural systems, the modern farm is viewed primarily as a production unit where the harvested product is rapidly transferred to agribusiness and food companies which have the necessary technological, management and financial resources to adequately treat and preserve farm produce in bulk.
As long as agricultural wages were relatively low, large farmers found it more efficient to maintain a tractor and truck along with some horses. Horses did virtually all the jobs for which power was not the overriding input. Each power source specialized in the tasks for which it had the greatest comparative advantage.