In sacco evaluation of ruminal degradability of waste vinegar residue as a feedstuff for ruminants

Abstract

Waste vinegar residue (WVR) is a by-product of vinegar processing by solid-state fermentation. In this study, two experiments were conducted to determine chemical composition and ruminal degradability of WVR and whether WVR can be used as a feedstuff for ruminants. In Experiment 1, 14 WVR samples were incubated in the rumen of three Inner Mongolia White Cashmere Goats to determine the in sacco ruminal degradability parameters for DM, crude protein (CP) and neutral detergent fibre (NDF). The NDF, CP and ether extract (EE) contents of the WVR samples were 796.6, 125.2 and 93.3 g/kg, respectively. The greatest variation was observed for lactic acid, which ranged from 150.39 to 4391.12 mg/kg with an average of 1023.84 mg/kg. The average A, B and C fractions of DM for the 14 samples of WVR were 122, 350, and 528 g/kg, respectively. The effective degradability of DM, CP and NDF were 275, 550 and 211 g/kg, respectively. In Experiment 2, the in sacco degradation parameters for DM, CP and NDF of Chinese leymus, corn stalk and WVR were evaluated in a 3 · 3 Latin-square design. The rapidly degradable fraction of the DM and NDF for WVR was significantly (P < 0.01) greater than that of Chinese leymus and corn stalk. No difference in rumen-degraded DM, rumen-degraded CP and rumen-degraded NDF was found between Chinese leymus and WVR (P > 0.05). It is concluded that, WVR is not well digested ruminally but is a good source of protein for ruminants giving it value as an ingredient in ruminant diets.

A Review of the Current State and Future Prospects in Resource Recovery of Chinese Cereal Vinegar Residue

“…In recent years, it has been applied as a nonconventional feed resource directly or in a fermented form for livestock feeding. Song et al determined the chemical composition and ruminal degradability of VR to assess its feasibility as a feed for ruminants [ 20 ]. VR could not be well digested due to the high lignin and ash content.…”

“…Chinese cereal VR contains various microbial metabolites and unutilized components from raw materials during vinegar fermentation, including starch, protein, fiber, lipids, organic acids and inorganic salts ( Table 1 ) [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], hence having a high resource recovery value. To maximize the disposal capacity and resource recovery value, it is important to develop and promote the use of environmentally friendly and cost-effective VR resource recovery technologies.…”

Enzymatic degradation of polysaccharides in Chinese vinegar residue to produce alcohol and xylose

“…Currently, the search for multi-purpose reuse of vinegar residue is a hot topic in the field. Nowadays, the main channels to reuse vinegar residue is the feed production and for use as cultivation substrates and bioenergy (Song et al 2013;Tian et al 2017). The application of vinegar residue in feed production can improve the nutritive value.…”

“…The application of vinegar residue in feed production can improve the nutritive value. However, as this process still produces by-products, the environmental pollution issue has not been completely solved (Yu et al 2009;Song 2012;Song et al 2013;Wang et al 2018). As cultivation substrates, vinegar residue can reduce cultivation and production costs, which in turn increase economic efficiency.…”

Degradation of Lignocellulosic Components in Un-pretreated Vinegar Residue Using an Artificially Constructed Fungal Consortium

“…VR is of poor nutritive value and low digestibility because of its high content of lignocellulosic components (Song et al 2013). In fact, it is estimated that 10 to 50 billion tons of lignocellulosic materials per year, accounting for about 50% of the biomass in the world, could be sustainably harvested (Claassen et al 1999).…”