Influence of main dietary chemical constituents on the vitro gas and methane production in diets for dairy cows

Laura Maccarana; Mirko Cattani; Franco Tagliapietra; Lucia Bailoni; Stefano Schiavon

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Influence of main dietary chemical constituents on the vitro gas and methane production in diets for dairy cows

机译：日粮主要化学成分对奶牛日粮中体外气体和甲烷产生的影响

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Background:Modification of chemical composition of diets fed to dairy cows might be a good strategy to reduce methane (CH4) production in the rumen.Notable reductions of CH4 production compared to conventional highroughages rations were more frequently observed for very concentrated diets or when fat supplements were used.In these cases,the reduction in the gas emission was mainly a consequence of an overall impairment of rumen function with a reduction of fiber digestibility.These strategies do not always comply with feeding standards used in intensive dairy farms and they are usually not applied owing to the risks of negative health and economic consequences.Thus,the present study evaluated the effects of seven commercial diets with contents of neutral detergent fiber (NDF),protein and lipids ranging 325 to 435 g/kg DM,115 to 194 g/kg DM,and 26 to 61 g/kg DM,respectively,on in vitro degradability,gas (GP),and CH4 production.Results:In this experiment,changes in the dietary content of NDF,crude protein (CP) and lipids were always obtained at the expense or in favor of starch.A decreased of the dietary NDF content increased NDF (NDFd) and true DM (TDMd) degradability,and increased CH4 production per g of incubated DM (P ＜ 0.001),but not that per g ofTDMd.Ar increase of the dietary CP level did not change in vitro NDFd and TDMd,decreased GP per g of incubated DM (P＜ 0.001),but CH4 production per g of TDMd was not affected.An increased dietary lipid content reduced NDFd,TDMd,and GP per g of incubated DM,but it had no consequence on CH4 production per g of TDMd.Conclusions:It was concluded that,under commercial conditions,changes in dietary composition would produce small or negligible alterations of CH4 production per unit of TDMd,but greater differences in GP and CH4 production would be expected when these amounts are expressed per unit of DM intake.The use of TDMd as a standardizing parameter is proposed to account for possible difference in DM intake and productivity.

机译：背景：调整奶牛日粮的化学成分可能是减少瘤胃中甲烷（CH4）产量的好策略。与传统的高粗粮日粮相比，在非常集中的日粮或补充脂肪的情况下，经常会出现CH4产量明显下降的情况。在这些情况下，气体排放量的减少主要是瘤胃功能整体受损以及纤维消化率降低的结果。这些策略并不总是符合集约化奶牛场的饲喂标准，通常不符合因此，本研究评估了7种商业饮食对中性洗涤剂纤维（NDF），蛋白质和脂质的含量范围为325至435 g / kg DM，115至194 g的影响/ kg DM和26至61 g / kg DM分别在体外降解性，气体（GP）和CH4产生方面。结果：在本实验中，饲料中日粮含量的变化NDF，粗蛋白（CP）和脂质总是以牺牲淀粉为代价或有利于淀粉获得的。饮食中NDF含量的减少增加了NDF（NDFd）和真正的DM（TDMd）的可降解性，并增加了每克培养的DM的CH4产量（P ＜0.001），但每g TDMd不变。在体外NDFd和TDMd中，日粮CP水平的增加没有变化，每g孵育的DM的GP降低（P ＜0.001），但每g TDMd的CH4产生饮食中脂质含量的增加降低了每克培养的DM的NDFd，TDMd和GP，但对每克TDMd的CH4产量没有影响。结论：结论是，在商业条件下，饮食组成的变化会每单位TDMd产生的CH4产量变化很小或可忽略不计，但是当以每单位DM摄入量表示这些量时，GP和CH4产量会有较大差异。建议使用TDMd作为标准化参数来考虑可能的差异在DM摄入量和生产量方面ty。

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《畜牧与生物技术杂志(英文版)》 |2017年第1期|99-106|共8页
作者
Laura Maccarana; Mirko Cattani; Franco Tagliapietra; Lucia Bailoni; Stefano Schiavon;
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Department of Comparative Biomedicine and Food Science(BCA),University of Padova, Viale dell'Università 16, 35020 Legnaro(PD), Italy;

Department of Comparative Biomedicine and Food Science(BCA),University of Padova, Viale dell'Università 16, 35020 Legnaro(PD), Italy;

Department of Agronomy, Food, Natural resources, Animals and Environment(DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro(PD), Italy;

Department of Comparative Biomedicine and Food Science(BCA),University of Padova, Viale dell'Università 16, 35020 Legnaro(PD), Italy;

Department of Agronomy, Food, Natural resources, Animals and Environment(DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro(PD), Italy;

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Influence of main dietary chemical constituents on the vitro gas and methane production in diets for dairy cows

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