| 不同饲养阶段快大型黄羽肉鸡异亮氨酸需要量研究 |
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| 引用本文： | 蒋守群,王一冰,林厦菁,范秋丽,李龙,程忠刚,郑春田.不同饲养阶段快大型黄羽肉鸡异亮氨酸需要量研究[J].中国畜牧兽医,2021(1). |
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| 作者姓名： | 蒋守群 王一冰 林厦菁 范秋丽 李龙 程忠刚 郑春田 |
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| 作者单位： | 广东省农业科学院动物科学研究所 |
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| 基金项目： | 国家重点研发计划(2018YFD0500600);国家肉鸡产业技术体系项目(CARS-41-G10);国家自然科学基金青年基金(31802104);广东省自然科学基金(2017A030310096);国家“十二五”科技支撑计划项目子课题(2014BAD13B02);广东省科技计划项目(2017B020202003);广州市科技计划重点项目(201804020091);广东省农业科学院院长基金项目(201620、201805、201807B、201809B、201908);科技创新战略专项资金(高水平农科院建设)(R2019PY-QF008)。 |
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| 摘 要： | 试验旨在研究不同饲养阶段快大型黄羽肉鸡异亮氨酸需要量。分别选取0、22和43日龄快大型岭南黄鸡2400、2160和1920只,按照性别和体重随机分为8个异亮氨酸梯度水平饲粮处理,每个处理6个重复(栏),公、母各3个重复,0~21、22~42、43~63日龄3个阶段每栏分别为50、45和40只鸡。各阶段基础饲粮异亮氨酸水平分别为0.55%、0.50%和0.45%。3个阶段各处理组饲粮均在基础饲粮中呈梯度添加异亮氨酸,组间间隔水平均为0.05%,各处理饲粮除异亮氨酸外其他营养水平均一致。试验鸡地面平养,自由采食颗粒料和自由饮水。结果显示,异亮氨酸水平和性别对3个阶段鸡生长性能均有显著影响,且异亮氨酸水平和性别间存在显著互作效应(P<0.05)。随着异亮氨酸水平提高,平均日增重和料重比均呈显著或极显著二次曲线变化(P<0.05;P<0.01)。双斜率折线模型预测结果显示,0~21日龄阶段,公鸡、母鸡和公母混合鸡群的异亮氨酸需要量,以平均日增重为衡量指标分别为0.77%、0.72%和0.73%,以料重比为衡量指标分别为0.75%、0.70%和0.73%;22~42日龄阶段,公鸡、母鸡和公母混合鸡群的异亮氨酸需要量,以平均日增重为衡量指标分别为0.68%、0.64%和0.66%,以料重比为衡量指标分别为0.66%、0.62%和0.64%;43~63日龄阶段,公鸡、母鸡和公母混合鸡群的异亮氨酸需要量,以平均日增重为衡量指标分别为0.64%、0.59%和0.61%;以料重比为衡量指标分别为0.61%、0.57%和0.59%。黄羽肉鸡异亮氨酸营养需要量随日龄增加而降低,各个饲养阶段公鸡的异亮氨酸需要量均显著高于母鸡,以料重比为评定指标得到异亮氨酸营养需要量低于以平均日增重为衡量指标得的需要量推荐值。
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| 关 键 词： | 黄羽肉鸡 生长性能 异亮氨酸 营养需要量 双斜率折线模型 |
Study on Isoleucine Requirement of Yellow-feathered Broiler Chickens in Different Feeding Stages |
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| JIANG Shouqun,WANG Yibing,LIN Xiajing,FAN Qiuli,LI Long,CHENG Zhonggang,ZHENG Chuntian.Study on Isoleucine Requirement of Yellow-feathered Broiler Chickens in Different Feeding Stages[J].China Animal Husbandry & Veterinary Medicine,2021(1). |
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| Authors: | JIANG Shouqun WANG Yibing LIN Xiajing FAN Qiuli LI Long CHENG Zhonggang ZHENG Chuntian |
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| Institution: | (Guangdong Provincial Key Laboratory of Animal Breeding and Nutrition,Key Laboratory of Animal Nutrition and Feed Science in South China,Ministry of Agriculture and Rural Affairs,State Key Laboratory of Livestock and Poultry Breeding,Institute of Animal Sciences,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China) |
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| Abstract: | This experiment was conducted to determine isoleucine(Ile)requirement of Yellow-feathered broiler chickens at different feeding stages.2400,2160 and 1920 Yellow-feathered broiler chickens of 0,22 and 43 days age were selected,according to gender and body weight,they were randomly divided into eight dietary treatments with six replicates(half male and half female),there were 50,45 and 40 chickens at 0-21,22-42 and 43-63 days of age,the levels of Ile in basal diet were 0.55%,0.50%and 0.45%,respectively.Ile was added gradiently in the basal diet in each treatment group,and the inter group interval level was 0.05%,the nutritional levels of all treatments were the same except for Ile.The experimental chickens were raised on the ground,and they were free to eat granular materials and drink freely.The results showed that the level of Ile and gender had significant effects on the growth performance of the three stages,and their interaction had significant effects on growth performance during the three stage(P<0.05).The average daily gain(ADG)and feed/gain(F/G)showed significant or extremely significant quadratic response with the increase of dietary Ile level(P<0.05;P<0.01).The prediction results of the two-slope broken-line model showed that,at 0-21 days of age,the optimal dietary Ile level that maximized ADG were 0.77%,0.72%and 0.73%,that optimized F/G were 0.75%,0.70%and 0.73%for male,female and mix chicks,respectively.At 22-42 days of age,the optimal dietary Ile level that maximized ADG were 0.68%,0.64%and 0.66%,that optimized F/G were 0.66%,0.62%and 0.64%for male,female and mix chicks,respectively.At 43-63 days of age,the optimal dietary Ile level that maximized ADG were 0.64%,0.59%and 0.61%,that optimized F/G were 0.61%,0.57%and 0.59%for male,female and mix chicks,respectively.In conclusion,the Ile requirement decreased with the increase of age,its requirement of male was significantly higher than that of female,and the nutrient requirement of Ile evaluated by F/G was lower than the recommended value based on ADG. |
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| Keywords: | Yellow-feathered broiler chickens growth performance isoleucine nutrient requirement two-slope broken-line model |
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