Disappearance and appearance of an indigestible marker in feces from growing pigs as affected by previous-and current-diet composition

Brandy M.Jacobs; John F.Patience; Merlin D.Lindemann; Kenneth J.Stalder; Brian J.Kerr

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Disappearance and appearance of an indigestible marker in feces from growing pigs as affected by previous-and current-diet composition

机译：受先前和当前饮食组成影响的成年猪粪便中难消化标记的消失和出现

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Background:Indigestible markers are commonly utilized in digestion studies,but the complete disappearance or maximum appearance of a marker in feces can be affected by diet composition,feed intake,or an animal's BW.The objectives of this study were to determine the impact of previous (Phase 1,P1) and current-(Phase 2,P2)diet composition on marker disappearance (Cr) and appearance (Ti) in pigs fed 3 diets differing in NDF content.Results:When pigs were maintained on the 25.1,72.5,and 125.0 g/kg NDF diets,it took 5.1,4.1,and 2.5 d,respectively,for Cr levels to decrease below the limit of quantitation;or 4.6,3.7,or 2.8 d,respectively,for Ti to be maximized.These effects were not,however,independent of the previous diet as indicated by the interaction between P1 and P2 diets on fecal marker concentrations (P ＜ 0.01).When dietary NDF increased from P1 to P2,it took less time for fecal Cr to decrease or fecal Ti to be maximized (an average of 2.5 d),than if NDF decreased from P1 to P2 where it took longer for fecal Cr to decrease or fecal Ti to be maximized (an average of 3.4 d).Conclusions:Because of the wide range in excretion times reported in the literature and improved laboratory methods for elemental detection,the data suggests that caution must be taken in considering dietary fiber concentrations of the past and currently fed diets so that no previous dietary marker addition remains in the digestive tract or feces such that a small amount of maker is present to confound subsequent experimental results,and that marker concentration have stabilized when these samples are collected.

机译：背景：消化研究中通常使用不易消化的标志物，但粪便中标志物的完全消失或最大出现可能受饮食组成，饲料摄入量或动物体重的影响。本研究的目的是确定先前的影响。饲喂3种日粮中NDF含量不同的猪的（阶段1，P1）和当前（阶段2，P2）饮食组成对标志物消失（Cr）和外观（Ti）的影响。和125.0 g / kg NDF日粮，分别将Cr水平降至定量限以下分别为5.1、4.1和2.5 d;或将Ti最大化为4.6、3.7或2.8 d分别。但是，P1和P2饮食之间的相互作用对粪便标志物浓度的影响并不独立于先前的饮食（P ＜0.01）。当饮食中NDF从P1升高到P2时，粪便Cr减少或排泄的时间更少与NDF从P1下降到P2的情况相比，Ti要最大化（平均2.5 d）粪便中的Cr减少或粪便中的Ti最大化所需的时间更长（平均3.4 d）。结论：由于文献中报道的排泄时间范围很广，并且元素检测的实验室方法得到改进，数据表明必须谨慎应考虑过去和当前进食的膳食纤维浓度，以使消化道或粪便中不再保留先前的膳食标记物，以致存在少量制造商来混淆后续的实验结果，并且当这些样品被收集。

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《畜牧与生物技术杂志(英文版)》 |2017年第3期|643-651|共9页
作者
Brandy M.Jacobs; John F.Patience; Merlin D.Lindemann; Kenneth J.Stalder; Brian J.Kerr;
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Department of Animal Science,Iowa State University,Ames 50010,USA;

Department of Animal Science,Iowa State University,Ames 50010,USA;

Department of Animal and Food Sciences,University of Kentucky,Lexington 40546,KY,USA;

Department of Animal Science,Iowa State University,Ames 50010,USA;

USDA-ARS-National Laboratory for Agricultural and the Environment,Ames 50010,IA,USA;

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Disappearance and appearance of an indigestible marker in feces from growing pigs as affected by previous-and current-diet composition

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