Effects of addition of different sources and doses of sugars on in vitro digestibilities of dry matter, fibre and cell wall monosaccharides of corn silage in ruminants

Abstract

In ruminant diets, soluble sugar is an important factor in the digestive process. The objective of this study was to evaluate the effects of the source and dose of soluble sugars, under controlled pH conditions, on the in vitro digestibility of DM, fibre fractions (NDF and ADF) and cell wall neutral monosaccharides of corn silage. Silage was collected from several points in a silage mass from a bunker silo, oven-dried at 55°C and ground through a 1-mm screen. Sub-samples were combined with sugars to compose the treatments, in a 5 × 5 factorial arrangement, as a combination of five soluble sugar sources (glucose, fructose, arabinose, xylose and sucrose) and five sugar doses (0, 100, 200, 300 and 400 g/kg sugar in DM corn silage), respecting the following proportions of sugar : corn silage, 0 : 100, 10 : 90, 20 : 80, 30 : 70, 40 : 60 represented by the sugar doses, respectively. An in vitro test was performed to determine the true digestibility (D) of the chemical entities (DM, NDF and ADF) and cell wall monosaccharides (glucose = gluc, arabinose = arab and xylose = xyl). During the first 12 h of incubation, the pH was maintained above 6.0 by the addition of 2.5 N NaOH. The concentrations of neutral monosaccharides (arabinose, xylose and glucose) were determined by GLC. The soluble sugars decreased the digestibility of corn silage followed by pH reduction, especially at doses higher than 200 g/kg sugar. Overall, xylose, followed by sucrose, fructose and arabinose, had greater impacts on DM digestibility, whereas fibre digestibility was impaired by sucrose at all doses. Xylose and fructose had greater impacts on NDF digestibility at 300 and 400 g/kg sugar. Although xylose impaired the Dgluc in the cell wall in all doses. All doses of glucose improved the Dgluc and Dxyl in the cell wall.

Nutritional parameters of female goat kids fed diets containing detoxified castor bean cake

“…The higher digestibility of the diets with DCC and, consequently, the better feed conversion by the goats fed these diets may be associated with a possible "ammonization" during the detoxification process, as alkaline products act on the fibrous plant cell fraction, causing hydrogen bonds to rupture and cellulose molecules to expand and become more susceptible to the action of cellulolytic enzymes. The alkaline products also led to hemicellulose solubilization due to the rupture of ester-like bonds between hemicellulose and lignin (Campos et al, 2020).…”

Granulated Cane Sugar as a Partial Replacement for Steam-Flaked Corn in Diets for Feedlot Cattle: Ruminal Fermentation and Microbial Protein Synthesis

“…The depression in fiber digestion with sucrose supplementation is more consistent when the ruminal pH is sufficiently depressed to affect the activity of the ruminal fibrolytic microbes. For example, Campos et al [41] observed that the NDF digestion of a corn silage-based diet was only reduced when the addition of sugar was greater than 20% (DM basis). It might be expected that when the ruminal digestion of NDF and starch are reduced, a concomitant reduction of ruminal OM digestion would also occur.…”

Granulated Animal Feed and Fuel Based on Sea Buckthorn Agro-Waste Biomass for Sustainable Berry Production

“…The amount of xylose was the highest for the stems of BL and TAT. Xylose is not a desirable component in feed: it was proven that in high amounts it could reduce ruminal digestibility of various animal feeds [61,62]. Therefore, for the subsequent first experiments, stem samples of MB with comparatively smaller content of xylose were chosen.…”