Other manufacturing industries in Virginia include (1) leather and leather products--with tanneries at Luray, Bristol, Pearisburg, Buena Vista and Salem; luggage-making at Petersburg and footwear-making at Lynchburg, Fredericksburg, Farmville and Halifax; (2) primary metals industry--with gray-iron foundries at Newport News, Lynchburg and Radford; (3) fabricated metals industry--with the manufacture of structural metal and structural and ornamental products at Richmond, Norfolk, Bristol and Alexandria; pressure vessels at Newport News; locks at Salem; swimming-pool type atomic reactors at Campbell County (near Lynchburg), and (4) non-electrical machinery industry--with hydraulic turbines, textile wool cards, pulp and papermaking machinery at Newport News, Crozet, Bristol and Richmond. Employment in Agriculture--A persistent trend in Virginia's economic picture is the continuous decline in agricultural employment, a condition characteristic of agriculture in the United States in general. Approximately 10% of the total employment is presently found in agricultural pursuits. Although the demand for agricultural commodities has increased, the output per worker in agriculture has increased more rapidly. The greater output has occurred as a result of improved methods of farming, technological advances and larger agricultural investments. This situation has resulted also in a greater variety of crops, improved breeds of livestock, and better control of insects and pests. In the past twenty years there has been a gradual shift in Virginia's agriculture from the production of crops to the production of livestock and livestock products. As a matter of fact, Virginia is a leader in the South in the relative importance of livestock and livestock products. Poultry and poultry products lead the distribution list, followed by meat animals (cattle and calves, hogs, sheep and lambs) and dairy products. Virginia ranks third in the production of turkeys in the United States and sixth in production of broiler chicks in the United States. Rockingham County is famous for its turkeys and chickens. "Cut-up chicken" meat, as well as broilers and eggs, constitutes important poultry products. Culpeper and Loudoun Counties have the greatest number of milk cows per square mile. Large manufacturing plants in the southwestern part of Virginia produce evaporated and condensed milk. Beef cattle are raised in almost every county in Virginia but the Southwest, the Shenandoah Valley and Northern Virginia are the three chief regions. In addition to the meat itself, by-products such as soap and fodder are manufactured and hides and skins are utilized in the making of miscellaneous articles. Hogs and pigs are found in great numbers in Southampton, Nansemond and Isle of Wight Counties and sheep and lambs in large numbers in Augusta, Russell, Rockingham and Highland Counties.