套算法用于估测肉用羊单一谷物饲料代谢能值及养分消化率的探索

doi:10.11843/j.issn.0366-6964.2016.07.013

摘要/Abstract

摘要：

本试验旨在研究使用套算法估测肉用羊单一谷物饲料能值的可行性及适宜的替代比例。试验选取54只体重为(48.3±1.3) kg的杜寒杂交F1代去势公羊，采用完全随机区组设计，平均分为9组，分别饲喂1种基础饲粮和8种不同小麦替代比例的试验饲粮，进行消化代谢和气体代谢试验测定消化能和代谢能，结合套算法计算小麦的消化能和代谢能及养分消化率，以确定其适宜的替代比例。结果表明：1）随着替换比例的增加，饲料中的各种养分的消化率逐渐升高，饲料中粪能逐渐降低，尿能、消化能和代谢能逐渐升高。2）根据套算法计算公式计算出小麦的总能、干物质、有机物、粗蛋白质的消化率在任何替换水平差异均不显著（P>0.05）。3）当小麦替换饲粮比例为28.37%～45.95%时，套算法所得的小麦消化能（14.55 MJ•kg^-1）与NRC的推荐值（14.52 MJ•kg^-1）基本一致；套算法所得小麦的代谢能（11.86 MJ•kg^-1）与通过经验公式（消化能×0.82）的计算值（11.91 MJ•kg^-1）接近。综上所述，套算法可以用于估测肉用羊单一谷物饲料代谢能值及养分消化率，且替换比例以28.37%～45.95%为宜，本试验中小麦替代饲粮的最佳比例为28.37%

关键词: 套算法, 消化能, 代谢能, 替代比例, 小麦

Abstract:

This study aimed to investigate the feasibility and approximate proportion of estimating metabolizable energy value of single grain using substitutional method.Fifty-four castrated Dorper×Thin-tailed Han crossbred rams (body weight，(48.3±1.3) kg) were randomly divided into 9 groups and fed one of the following 9 experimental diets：basal diet and 8 experimental diets with different substitutional ratio of wheat.Digestibility and respirometry trials were conducted to measure digestible and metabolizable energy (DE and ME) and to determine the appropriate substitutional ratio of wheat for daily ration.The results showed as following：1)With the increasing of substitutional ratio of wheat，the nutrient digestibility，urine energy，DE and ME were improved，whereas the fecal energy was decreased.2) The digestibility of gross energy，dry matter，organic matter and crude protein in wheat that was calculated by the substitutional method were not affected by treatments (P>0.05).3) When the substitutional ratio of wheat was in the range of 28.37%-45.95%，the DE and ME of wheat were 14.55 MJ•kg-1 and 11.86 MJ•kg-1.They were respectively similar to 14.52 MJ•kg-1 recommended by NRC (2007) and 11.91 MJ•kg-1 calculated from experimential equation (DE×0.82).In conclusion，the appropriate substitutional ratio of single concentrate in mutton sheep diet is in range of 28.37%-45.95% and the optimal substitutional ratio of wheat for daily ration is 28.37% in the current study.

Key words: substitutional method, digestible energy, metabolizable energy, substitutional ratio, wheat

中图分类号:

S826
S815.4

赵江波，魏时来，马涛，赵明明，肖怡，刁其玉. 套算法用于估测肉用羊单一谷物饲料代谢能值及养分消化率的探索[J]. 畜牧兽医学报, 2016, 47(7): 1405-1413.

ZHAO Jiang-bo，WEI Shi-lai，MA Tao，ZHAO Ming-ming，XIAO Yi，DIAO Qi-yu. Investigation of Substitutional Methods for Evaluating Metabolizable Energy and Nutrient Digestibility of Single Grain in Mutton Sheep[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2016, 47(7): 1405-1413.

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