Yanza Yulianri Rizki, Fitri Ainissya, Suwignyo Bambang, Hidayatik Nanik, Kumalasari Nur Rochmah, Irawan Agung, Jayanegara Anuraga
Animal Feed and Nutrition Modelling (AFENUE) Research Group, IPB University, Bogor 16680, West Java, Indonesia.
Department of Biology Education, Faculty of Teacher Training and Education, Universitas Islam Riau (UIR), Pekanbaru 28284, Riau, Indonesia.
Animals (Basel). 2021 Nov 19;11(11):3317. doi: 10.3390/ani11113317.
The objective of this meta-analysis was to elucidate whether there are general underlying effects of dietary tannin extract supplementation on rumen fermentation, digestibility, methane production, performance, as well as N utilisation in ruminants. A total of 70 papers comprised of 348 dietary treatments (from both in vivo and in situ studies) were included in the study. The database was then statistically analysed by the mixed model methodology, in which different experiments were considered as random effects and tannin-related factors were treated as fixed effects. The results revealed that an increased level of tannin extract inclusion in the diet lowered ruminant intake, digestibility, and production performance. Furthermore, the evidence also showed that an increased level of tannin extract decreased animal N utilisation where most of rumen by-pass protein was not absorbed well in the small intestine and directly excreted in the faeces. Due to the type of tannin extract, HT is more favourable to maintain nutrient intake, digestibility, and production performance and to mitigate methane production instead of CT, particularly when supplemented at low (<1%) to moderate (~3%) levels.
本荟萃分析的目的是阐明补充膳食单宁提取物对反刍动物瘤胃发酵、消化率、甲烷产生、生产性能以及氮利用是否存在普遍的潜在影响。该研究共纳入了70篇论文，涵盖348种膳食处理（包括体内和体外研究）。然后采用混合模型方法对数据库进行统计分析，将不同实验视为随机效应，将单宁相关因素视为固定效应。结果表明，日粮中单宁提取物添加水平的提高会降低反刍动物的采食量、消化率和生产性能。此外，证据还表明，单宁提取物添加水平的提高会降低动物的氮利用率，因为大部分瘤胃过瘤胃蛋白在小肠中吸收不佳，直接随粪便排出。由于单宁提取物的类型，相比于缩合单宁（CT），水解单宁（HT）更有利于维持营养物质的摄入量、消化率和生产性能，并减少甲烷的产生，尤其是在低（<1%）至中（~3%）水平添加时。
