AA肉仔鸡脂肪沉积规律研究与腹脂沉积模型的建立  

Abdominal fat deposition curve of male AA broilers

作　　者：杨凌云[1] 蔡辉益[1] 闫海洁[1] 张姝[1] 刘志云[1] 

机构地区：[1]中国农业科学院饲料研究所农业部饲料生物技术重点开放实验室,北京100081

出　　处：《饲料工业》2015年第13期25-29,共5页Feed Industry

基　　金：现代农业产业技术体系专项基金[CARS-42]

摘　　要：试验旨在研究现代商品肉仔鸡脂肪沉积规律，建立腹脂重随日龄变化的生长模型，为营养因素调控腹脂沉积提供理论支持。试验选用144只1日龄AA公肉仔鸡，随机分为6个重复，每重复24只鸡。屠宰试验时记录活重，腹脂重以及皮下脂肪厚，计算腹脂率。根据所测数据计算累积生长系数、相对生长系数。用3种生长模型对腹脂重、活重随日龄的变化关系进行方程拟合，计算相关参数并比较其拟合度。结果表明，腹脂的沉积模型拟合度达到0．965，腹脂沉积的拐点在28日龄左右，快速沉积阶段为21～35日龄。腹脂拐点日龄早于活重的生长拐点日龄（35d）。皮下脂肪厚随日龄增加线性增长，线性回归方程拟合度R^2〉0．99。通过饲粮调控腹脂沉积的最佳时间为21～35日龄，皮下脂肪厚可以作为观测脂肪沉积的活体指标，对生产具有指导意义。This experiment was conducted to study fat deposition model in abdominal and subcutaneous area of AA broilers to provide a theoretical basis for nutritional regulation of deposition of fat. A total of 144 one-day-old male AA broilers were randomly designed into 6 replicates with 24 broilers per cage. Broilers were slaughtered weekly from 1 to 42 days of age. Live weight, abdominal fat weight and subcutaneous fat thickness were measured; relative growth coefficients were also calculated. Three non-linear growth models were chosen to fit the data of abdominal fat weight and live weight. The result showed that the best fitted equation （R^2=0.965） that predicted maximum growth rate of abdominal fat weight occurred at 28 d, earlier than live weight. Abdominal fat weight increased quickly at 21-35 days of age, which can be concluded the best time to regulating the deposition of fat. Change of fat de- position rate was probably a result of nutrition change. Subcutaneous fat thickness increased linearly, it can be used as indicator of fat deposition in vivo.

关 键 词：肉仔鸡 脂肪沉积 腹脂 皮下脂肪厚 生长模型 

分 类 号：S831.5[农业科学—畜牧学]