UMR1388 Génétique, Physiologie et Systèmes d'Elevage, Université de Toulouse INPT ENSAT, Castanet-Tolosan, France.
UMR1388 Génétique, Physiologie et Systèmes d'Elevage, INRA, Castanet-Tolosan, France.
J Anim Physiol Anim Nutr (Berl). 2018 Apr;102(2):393-402. doi: 10.1111/jpn.12855. Epub 2018 Jan 19.
The ruminal ecosystem is a fermentative milieu which is interesting to discuss in terms of its redox status as a reflection of an intense bacterial activity. The objective of this systematic literature review is to quantitatively analyze data collected on redox potential (Eh) in the rumen and to explore relationship between ruminal Eh, nature of the diet fed to ruminants, and ruminal fermentation parameters. Data obtained from 15 studies comprising 24 different diets was used in the analysis. Studies included in the data file were selected based on the criteria of: (i) the nature of the reference electrode was specified, (ii) the ruminal Eh was recorded simultaneously to pH, (iii) animal body weight (BW) and dry matter intake (DMI) were reported and (iv) the composition of the diet was precisely described. Results showed a high variability in ruminal Eh values. However, all recorded values are markedly negative reflecting the absence of oxygen and the strong reducing power of the rumen environment. The main factors contributing to the variation were the method of Eh measurement and the nature of the diet fed to ruminants. Redox potential was positively correlated with DMI and proportion of concentrate in the diet, and tended to be positively correlated with soluble carbohydrates content. In contrast, it was negatively correlated with neutral detergent fibre from forages. The hierarchical ascendant classification discriminated two groups of diets leading to significant change in ruminal Eh level. Ruminal Eh was negatively correlated with pH, total volatile fatty acids produced and proportion of acetate, and positively correlated with proportion of propionate. This review revealed Eh to be dependent on the diet composition and DMI, at least within the range of diets included in the database.
瘤胃生态系统是一种发酵环境，其氧化还原状态反映了强烈的细菌活动，因此很值得讨论。本系统文献综述的目的是定量分析瘤胃氧化还原电位（Eh）的数据，并探讨瘤胃 Eh 与反刍动物所饲日粮的性质以及瘤胃发酵参数之间的关系。分析中使用了来自 15 项研究的数据，这些研究涉及 24 种不同的日粮。被纳入数据文件的研究是根据以下标准选择的：（i）明确了参考电极的性质，（ii）同时记录了 pH 值和瘤胃 Eh，（iii）报告了动物体重（BW）和干物质采食量（DMI），以及（iv）精确描述了日粮的组成。结果表明，瘤胃 Eh 值的变化很大。然而，所有记录的值都明显为负，这反映了氧气的缺乏和瘤胃环境的强烈还原能力。导致 Eh 值变化的主要因素是 Eh 测量方法和反刍动物所饲日粮的性质。Eh 值与 DMI 和日粮中精料的比例呈正相关，且与可溶性碳水化合物含量呈正相关趋势。相反，它与饲草料中的中性洗涤纤维呈负相关。层次聚类分析将日粮分为两组，导致瘤胃 Eh 水平发生显著变化。Eh 值与 pH 值、总挥发性脂肪酸产量和乙酸比例呈负相关，与丙酸比例呈正相关。本综述表明，Eh 值至少在数据库中包含的日粮范围内，取决于日粮组成和 DMI。
