中国农业科学2023，Vol.56Issue(22)：4552-4560,9.DOI:10.3864/j.issn.0578-1752.2023.22.015
1-60日龄文昌鸡母鸡净能需要量预测模型研究
Modeling Net Energy Requirement of 1-60 Days Old Wenchang Hen
摘要
Abstract
[Objective]The aim of this study was to determine the net energy requirements of Wenchang hens aged 1-60 days,so as to provide a scientific basis for efficient breeding of Wenchang hens.[Method]The net energy requirements of growth(NEg)and maintenance(NEm)of Wenchang hens aged 1-30 and 31-60 days were estimated by factorial method.In experiment 1,three hundred 1-day-old healthy Wenchang chicken chicks were randomly divided into 6 replicates and routinely fed until 56 days of age.The body weight(BW)and net body energy(BE)of Wenchang hens were measured every week,and then a linear regression model between BW and BE was established.The slope was the NEg of Wenchang hen.The NEm of Wenchang hens was investigated in two phases.Two hundred and forty healthy Wenchang hens with similar BW were selected at 1 and 31 days of age,respectively.The birds were randomly divided into four treatment groups with six replicates.The four treatment groups were fed the same metabolic diets,which were ad libitum,20%,40%and 60%restricted.Test period was 30 days per period.During the middle stage of the experiment(14 and 44 days old),excreta were collected continuously for 3 days to determine dietary apparent metabolizable energy(AME)at different feeding levels;at the beginning and end of each stage,retained energy(RE),metabolizable energy intake(MEi)and heat production(HP,HP = MEi-RE)of Wenchang hens were measured,and a regression model between the logarithm of HP and MEi was established:lg(HP)= a + b×MEi;the HP when MEi = 0 was calculated,which was the NEm of Wenchang hens.[Result]With the increase of age,BW,daily gain(ADG),feed intake(ADFI),feed conversion ratio(G/F)and BE of Wenchang hens significantly increased(P＜0.001).The NEg value was 8.20 and 12.07 kJ·g-1 in Wenchang hens aged 1-30 days and 31-60 days,respectively.Restriction significantly increased the AME value of diet(P＜0.001);MEi and HP significantly decreased with the decrease of food intake(P＜0.001);there was a significant logarithmic regression relationship between MEi and log HP(R2 = 0.91 and 0.90,P＜0.001),and the NEm value at 1-30 days and 31-60 days of age was 300.61 and 398.11 kJ·kg-1BW0.75·d-1,respectively.[Conclusion]The NEg and NEm of Wenchang hens were different at different growth stages,and the daily net energy requirement of Wenchang hens could be predicted according to BW and ADG.The prediction models were:NE1-30d = 300.61×BW0.75 + 8.20×ADG and NE31-60d = 398.11×BW0.75 + 12.07×ADG.关键词
文昌鸡母鸡/维持净能需要量/生长净能需要量/生长阶段/预测模型Key words
Wenchang hen/net energy requirement for maintenance/net energy requirement for growth/growth stage/predictive model引用本文复制引用
徐小静,魏立民,赵少猛,赵桂苹,张敏红,冯京海..1-60日龄文昌鸡母鸡净能需要量预测模型研究[J].中国农业科学,2023,56(22):4552-4560,9.基金项目
农业农村部文昌鸡优势特色产业集群项目(WCSCICP20211106)、国家现代农业肉鸡产业技术体系专项(CARS-41-Z12)、中国农业科学院科技创新工程(ASTIP-IAS07) （WCSCICP20211106）
