鸡属于鸟纲,具有鸟的生物学特性,其外形特征、生理特性与生产性能等与家畜均有显著差别。养鸡业发展历史悠久,养殖范围分布很广。近年来在畜牧业发展中占有相当重要的地位,是畜牧业生产的重要组成部分。 Chicken is an aviary, with the biological characteristics of birds, its shape, physiological characteristics and production performance and livestock are significantly different. The chicken industry has a long history of development, farmed area is widely distributed. In recent years, occupy a very important position in the development of animal husbandry, which is an important part of animal husbandry production.