动物营养学报 >

2015 , Vol. 27 >Issue 9: 2705 - 2713

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.09.008

禽营养 Poultry Nutrition

评定天府肉鸭玉米净能的研究

  • 米成林 ,
  • 贾刚 ,
  • 陈小玲 ,
  • 赵华 ,
  • 刘光芒 ,
  • 王康宁 ,
  • 文敏
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  • 四川农业大学动物营养研究所, 雅安 625014

收稿日期: 2015-03-19

  网络出版日期: 2015-09-12

基金资助

四川省科技支撑计划(2013NZ0054);四川农业大学双支计划

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Study on Evaluating the Net Energy of Corn for Tianfu Duck

  • MI Chenglin ,
  • JIA Gang ,
  • CHEN Xiaoling ,
  • ZHAO Hua ,
  • LIU Guangmang ,
  • WANG Kangning ,
  • WEN Min
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  • Animal Nutrition Institute, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2015-03-19

  Online published: 2015-09-12

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摘要

本研究旨在评定天府肉鸭上玉米的净能(NE),并通过回归分析构建与其化学成分相关的预测模型。试验共选出7日龄时平均体重为(125.01±11.33) g的天府肉鸭860只,4~7日龄为预试期,7~15日龄为正试期。采用析因法将玉米的NE剖分为提供给肉鸭的维持净能(NEm)和生产净能(NEp)。NEm用肉鸭禁食产热(FHP)计算得到,FHP用回归法测定,即用食入代谢能(MEI)和产热(HP)建立回归方程,并外推到MEI为0时的HP即为FHP;NEm试验共使用肉鸭120只,20只在7日龄时屠宰作为对照,剩下的设自由采食、限饲20%、限饲32%、限饲44%和限饲54%共5个饲喂水平。NEp采用比较屠宰试验测定,共使用肉鸭740只,试验初屠宰20只用作对照,剩余的分为36个处理。NEm和NEp试验均是每个处理5个重复,每个重复4只。15日龄时将肉鸭全部屠宰。将所测玉米NE与其化学成分进行回归分析并建立预测模型。试验结果表明:玉米提供给天府肉鸭的NEm为(0.95±0.05) MJ/kg,NEp为(8.49±0.35) MJ/kg,玉米的NE为(9.44±0.35) MJ/kg,代谢能转化为NE的效率为(70.12±2.00)%;使用玉米NE和其化学成分进行多元线性逐步回归,得到的最优模型为NE=6.956-0.13NDF+0.446EE-0.264ADF+0.241AME,其R2为0.923,RSD为0.03 MJ/kg。由此可见,通过玉米化学成分建立预测模型评估玉米NE是可行的。

关键词： 天府肉鸭; 玉米; 净能; 化学组成; 预测模型

本文引用格式

米成林 , 贾刚 , 陈小玲 , 赵华 , 刘光芒 , 王康宁 , 文敏 . 评定天府肉鸭玉米净能的研究[J]. 动物营养学报, 2015 , 27(9) : 2705 -2713 . DOI: 10.3969/j.issn.1006-267x.2015.09.008

Abstract

The present study was conducted to evaluate the net energy of corn and to establish prediction models for net energy of corn based on its chemical composition for Tianfu ducks. A total of 860 ducks with an average weight of (125.01±11.33) g at the age of 7 days were picked out for the experiment. The duck from 4 to 7 days of age was the pretest period of the experiment, and the formal experiment period was from 7 to 15 days of age. The net energy of corn equivalented to the sum of the net energy for maintenance (NEm) and net energy for production (NEp) on ducks. NEm was estimated by fasting heat production (FHP). The FHP was measured by establishing regression equation and extrapolating HP measured at 5 feeding levels including ad libitum and restricted feeding by 20%, 32%, 44% and 54% to zero ME intake. A total of 120 ducks were selected for the evaluation of NEm from which 20 ducks were slaughtered at 7 days of age to obtain baseline body energy. The other 100 ducks were randomly allotted to the 5 feed levels. NEp was calculated using the comparative slaughter technique. A total of 740 ducks were picked out for the experiment of NEp, from which 20 ducks were killed to obtain baseline body energy at the beginning of the experiment and others were randomly allotted to 36 corns. Both in the experiment of NEm and NEp each treat group was provided to 20 ducks housed in cages with 4 ducks per repetition and 5 replications. At the end of experiment all ducks were slaughtered to determine final body energy. Multiple linear stepwise regression analyses were conducted to evaluate the predictability of the net energy values and the chemical composition of corns. The results showed that NEm and NEp of duck provided by corn were (8.49±0.35) and (0.95±0.05) MJ/kg, respectively. The NE of corn were (9.44±0.35) MJ/kg, and the net energy values contributed (70.12±2.00)% of the apparent metabolizable energy. The best prediction model was NE=6.956-0.13NDF+0.446EE-0.264ADF+0.241AME, in which R2 and RSD were 0.923 and 0.03 MJ/kg, respectively. Therefore, it is feasible to evaluate NE of corn by prediction model established based on its chemical composition.

Key words： Tianfu ducks; corn; net energy; chemical composition; prediction models

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