关键词: 瑶鸡； 体重； 内脏器官； 生长发育

Abstract: This study aimed to research the growth and development of Yao chicken’s weight and organ under the management procedures of Hongguang agriculture and animal Husbandry Co.，Ltd. From 0 to 15 weeks，120 cocks and 120 hens were randomly selected to weigh and record their body weight every weekend. Thereafter，5 cocks and 5 hens were randomly selected，and the growth and development of main tissues and organs，such as heart，liver， spleen，glandular stomach，muscular stomach，bursa of Fabricius，pancreas and intestine were measured. Results showed that there was significant difference（P<0.05）in body weight of cocks and hens between 2 weeks of age. Meanwhile，there was significant difference（P<0.01）in body weight between cocks and hens in other weeks. The growth inflection points of cocks and hens of Yao chickens were 13.71 weeks and 12.59 weeks，respectively，and their body weight t were 2238.17 g and 1575.96 g，respectively. The change trend of organ index of cocks and hens are consistent. The relative indexes of heart，muscle stomach，glandular stomach，and liver of cocks and hens were higherin the first week，and then decreased gradually. This study showed that Yao chickens give priority to the development of heart，liver，stomach and other important organs，which can contribute to nutrient absorption and increasing body weight in the early growth stage. This study also suggested that the full price and balance of nutritional ratio before 13 weeks should be strengthened in order to improve growth efficiency of Yao chickens.

Key words: Yao chicken； Body weight； Internal organs； Growth and development