机构地区:[1]中国农业科学院北京畜牧兽医研究所畜禽营养与饲养全国重点实验室,北京100193 [2]山西农业大学动物科学学院,太谷030801 [3]佛山市高明区新广农牧有限公司,佛山528000
出 处:《畜牧兽医学报》2025年第3期1313-1323,共11页ACTA VETERINARIA ET ZOOTECHNICA SINICA
基 金:国家重点研发计划项目(2021YFD1300404);现代农业产业技术体系建设专项资金(CARS-41);中国农业科学院科技创新工程(ASTIP-IAS07)。
摘 要:旨在研究广明2号肉鸡蛋白质需要量的预测模型并进行验证。首先测定蛋白质的生长需要量(生长试验),然后结合本课题组前期测定的蛋白质维持需要量,建立肉鸡蛋白质需要量预测模型并进行验证(验证试验)。生长试验选择体重接近的1日龄广明2号公、母鸡各132只,根据性别随机分为2个处理组,每处理6个重复,每重复22只鸡。肉鸡自由采食玉米-豆粕型饲粮,饲喂至42日龄。每周测定肉鸡的体重和体蛋白重,建立体重与体蛋白重之间的线性回归方程,斜率即为肉鸡蛋白质的生长需要量。验证试验分三个阶段(0~10日龄、11~24日龄、25~39日龄)分别开展。在0、11和25日龄时,分别选择200、150、100只健康广明2号肉鸡,随机分为对照组和试验组,分别按照Aviagen育种公司推荐标准和预测模型计算出的蛋白质需要量配制饲粮,每个处理组5个重复。生长试验发现:21日龄和42日龄广明2号公鸡的生产性能显著高于母鸡(P<0.01);分阶段建立肉鸡体重与体蛋白重的线性回归方程,回归模型均达到显著水平(P<0.001),前期R 2均为0.99,后期为0.98;根据线性回归方程计算出肉鸡体蛋白的生长需要量,再按照饲粮蛋白质的沉积效率,进一步计算出肉鸡饲粮蛋白质的生长需要量:1~21日龄公、母鸡分别为每克日增重(ADG)需要0.251和0.228 g饲粮蛋白质(单位表示为g·g^(-1)ADG),22~42日龄公、母鸡分别为0.272和0.268 g·g^(-1)ADG。结合课题组前期测定的蛋白质维持需要量,建立蛋白质需要量(Crude protein requirement,CPR)预测模型:0~21日龄:CPR=2.365×BW 0.75+0.251×ADG(公鸡),CPR=3.165×BW 0.75+0.228×ADG(母鸡);22~42日龄:CPR=2.955×BW 0.75+0.272×ADG(公鸡),CPR=2.560×BW 0.75+0.268×ADG(母鸡)。验证试验发现:0~10日龄阶段,试验组肉鸡体重和日增重显著高于对照组(P<0.05),而11~24日龄和25~39日龄阶段,试验组肉鸡体重和日增重显著低于对照组(P<0.05)。试验组饲粮的�The aim of this experiment was to research and validate the prediction model of protein requirement of Guangming No.2 broiler.First,the protein growth requirement of broiler is measured(growth test),and then combined with the protein maintenance requirement measured in the previous stage of this project by the writer’s team,a prediction model of protein requirement of broiler is established and verified(validation test).The growth test was designed with a completely randomized trial,and 1321-day-old Guangming No.2 male and female broilers with similar body weight were selected,and they were divided into 2 treatment groups according to sex,with 6 replicates and 22 birds per replicate.They were fed a corn-soybean meal diet until 6 weeks of age.The body weight and body protein weight of broilers were measured weekly,and a linear regression equation between body weight and body protein weight was established,and the slope was the growth requirement of broiler protein.The validation test was carried out in three phases(0-10 days of age,11-24 days of age,and 25-39 days of age).At 0,11 and 25 days of age,200,150 and 100 healthy Guangming No.2 broilers were selected,and the broilers were randomly divided into control group and experimental group,with 5 replicates in each treatment group.The control and experimental diets were formulated according to Aviagen recommended standards and predicted protein requirements,respectively.The growth test showed that the production performance of 21 d and 42 d Guangming No.2 male broilers was significantly higher than that of female broilers(P<0.01).The linear regression equation of broiler body weight and body protein weight was established in stages,and the regression model all reached significant level(P<0.001),with R 2 of 0.99 in the early stage and 0.98 in the late stage.According to the linear regression equation,the growth requirement of body protein is calculated,and the growth requirement of diet protein is further calculated according to the deposition efficiency of dietar
关 键 词:广明2号肉鸡 析因法 蛋白质生长需要量 蛋白质需要量预测模型 验证试验
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...