Southdown sheep wool and cereals due to rising volumes of imports from the British Empire was accompanied by the Wet Years - a six-year period of cold, wet weather with little sun. In the Second World War, the South Downs were commandeered for military training, only fringe farms being left to produce milk for the towns. Sheep farming declined further after the war, although it is now being encouraged again through the designation of the downland as an environmentally sensitive area, and the restoration of arable land to sheepwalk. The Southdown has been placed on a watch list by the Rare Breeds
Breed known as breed traits, are inherited, and purebred animals pass such traits from generation to generation. Thus, all specimens of the same breed carry several genetic characteristics of the original foundation animal(s). In order to maintain the breed, a breeder would select those animals with the most desirable traits to achieve further maintenance and developing of such traits. At the same time, the breed would avoid animals carrying characteristics undesirable or not typical for the breed, including faults or genetic defects. The population within the same breed should consist of a sufficient number of animals to maintain the breed within