1. Product Introduction The Simenqian pig is a medium-sized pig with black hair on both ends and white hair on the rest. There is a star formed by white hair on the forehead. There are 68 pairs of 0. The head shape is divided into lion head type and spoon-shaped tube mouth type. The whole body is slightly barrel-shaped, the ears are medium-sized and drooping, the neck is slightly thick and short, the back is slightly straight, the abdomen is slightly drooping, the buttocks are slightly tilted, the thighs are plump, the whole body is coarse and sparse, and the skin is slightly thick. The meat is bright, light red, the color is uniform, the surface is shiny, the marble pattern is obvious, and the fat is white. The meat is tender, the taste is smooth, the meat is fresh and fragrant, and the fat is not greasy. 2. Natural ecological environment and cultural and historical factors Hengyang County is located in the northwest edge of the "Hengyang Basin" south of Hengshan Mountain. It is surrounded by mountains on the north, northwest and southwest sides, with undulating hills in the middle and small flat lands scattered around. It has a subtropical monsoon humid climate, with an average annual temperature of 17.9, an average annual sunshine of 1500h, an average annual accumulated temperature of 5667, and an average annual precipitation of 1237mm. The Xiangjiang River and its tributaries run through the entire territory, with ponds and reservoirs scattered throughout. The territory is dominated by red soil and purple rock soil, with a deep soil layer, fertile soil, high organic matter content, and rich in mineral elements such as manganese, iron, and zinc. The unique natural ecological environment provides the Simenqian pig with high-quality forage resources such as sweet potatoes, rice bran, and radishes, ensuring the unique character and excellent quality of the Simenqian pig. III. Geographical scope The geographical protection scope of the Simenqian pig agricultural product geographical indication includes Qulan Town, Hongshi Town, Da'an Township, Jinlan Town, Sanhu Town, Zhajiang Town, Yanpi Town, Kuzongqiao Town, Shishi Town, Chang'an Township, Lanlong Township, Taiyuan Town, Xidu Town, Xianshan Town, Jingtou Town, Guanshi Town, Banshi Township, Shanqiao Town, Jinxi Town, Jiepai Town, Jibing Town, Kuoxiang Township, Xijiang Township, Zhangmu Township, and Zhangshu Township in Hengyang County, a total of 25 towns and 443 administrative villages. The geographical coordinates are 1120'29"11244'20" east longitude and 2652'51"2740'34" north latitude. The annual output is 120,000 heads. IV. Product quality characteristics 4.1 External sensory characteristics Simenqian pigs are medium-sized pigs with black hair on both ends and white hair on the rest. There is a star formed by white hair on the forehead, 68 pairs of 0, and the head type is divided into lion head type and spoon tube mouth type. The whole body is slightly barrel-shaped, the ears are medium-sized and drooping, the neck is slightly thick and short, the back is slightly straight, the abdomen is slightly drooping, the buttocks are slightly tilted, the thighs are plump, the whole body is coarse and sparse, and the skin is slightly thick. The meat color is bright, light red, the color is uniform, the surface is shiny, the marble pattern is obvious, and the fat is white. The meat is tender, the taste is smooth, the meat tastes fresh and fragrant, and the fat is not greasy. 4.2 Internal quality indicators Protein content is 19g/100g, the total amount of flavor amino acids is 6g/100g, the total amount of amino acids is 16.5g/100g, and the fat is 2.90.5g/100g. 4.3 Safety requirements: refer to the provisions of GB2762 and GB2763.