-15- of total production which was marketed was above the regional average for Florida, Texas and Tennessee. The proportion of output marketed was above the United States average only in Florida. The percent of production marketed in 1960 ranged to a low of 68.6 percent in Alabama. Number of Cows and Production per Cow.--Similar trends in numbers of cows and production per cow have occurred in the United States and the Southern Region. The United States dairy cow population increased from 21,503,000 in 1925 to 25,033,00 in 1945 but has declined since (Table 7). The cow population in the ten states of the Southern Region in 1960 was 2,908,000. This was a considerable decline from the 4,708,000 reported in 1945. It was also substantially below the 1925 total of 3,493,000 dairy cows. The number of cows in Florida has shown a continuous increase from 1925 to 1960. The 195,000 cows on farms in Florida in 1960 were more than two and one-half times as large as the number in 1925. Despite the large reduction in numbers of dairy cows from 1925 to 1960, the increase in production per cow was more than ample to con- tinue increases in total milk production, both in the United States and the Southern Region. From 1925 to 1960, annual production per cow in the United States rose from 4,218 to 7,004 pounds. Annual production per cow in the Southern Region increased from 2,880 to 4,680 pounds. The increase was far greater in Florida. Annual output per cow in- creased from 2,850 pounds in 1925 to 6,700 pounds in 1960. TABLE 7.--Number of Cows on Farms and Production per Cow, United States, and Southern Region, 1925-1960 Number of Cows : Production per Cow: Index of Production: SYear. per Cow : United: Scuthern: United: Southern: United : Southern. :States: Rrgion : States: Region : States: Region : Thousands Founds 1925=100 1925 21,503 3,493 4,218 2,880 100 100 1930 22,218 3,782 4,508 3,160 107 110 1935 24,187 4,466 4,184 2,900 99 101 1940 23,671 4,328 4,622 3,150 110 109 1945 25,033 4,708 4,787 3,270 113 114 1950 21,944 4,158 5,314 3,550 126 123 1955 21,044 3,887 5,842 3,793 138 132 1960 17,549 2,908 7,004 4,680 166 162 Source: U. S. Department of Agriculture, Agricultural Marketing Service, Dairy Statistics, Statistical Bulletin No. 218 (Washington, D. C.: October 1957). Also, U. S. Department of Agriculture, Statis- tical Reporting Service, Crop Reporting Board, Milk Production, Disposition and Income 1959-60 (Washington, D. C.: April 1961).