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

摘要： 本文旨在研究在广西鸿光农牧有限公司饲养管理规程下瑶鸡体重和内脏器官的生 长发育规律。0～15周，每周末随机抽取公鸡120只，母鸡120只，称量每只鸡的体重并记录。 随机抽取公鸡和母鸡各5只，解剖后测定心脏、肝脏、脾脏、腺胃、肌胃、法氏囊、胰腺和肠道等 主要组织器官的生长发育情况，以器官指数表示。结果显示，第2周龄公鸡和母鸡的体重呈现 显著性差异（P<0.05），其余周龄公鸡和母鸡的体重差异极显著（P<0.01）。公鸡的13.71周龄和 母鸡的12.59周龄是瑶鸡的生长拐点周龄，拐点体重分别为2238.17 g和1575.96 g。公鸡母鸡 的器官指数变化规律一致，公鸡和母鸡的心脏、肌胃、腺胃、肝脏均在第一周的指数最大，随后 逐渐减小。由此可见，广西瑶鸡优先发育心脏、肝脏、胃等重要代谢及消化器官，为生长前期 快速吸收营养，增长体重奠定基础。这提示，应加强前13周鸡饲料营养配比的全价和平衡管 理，以提高瑶鸡的生长效率。

关键词: 瑶鸡； 体重； 内脏器官； 生长发育