Effects of mannanase and distillers dried grain with solubles on growth performance, nutrient digestibility, and carcass characteristics of grower-finisher pigs1

Abstract

Four experiments were conducted to determine the effects of dietary supplementation of corn distillers dried grain with solubles (DDGS) diets with mannanase on performance, apparent total tract digestibility (ATTD) of energy and nutrients, blood metabolites, and carcass characteristics of grower-finisher pigs. In Exp. 1, 96 grower pigs (initial BW, 57.6 kg), 6 pigs per pen and 4 pens per treatment, were fed corn-soybean meal-based diets containing 10% DDGS and 0, 200, 400, or 600 units (U) of mannanase/kg. The ADG and blood glucose increased (linear, P < 0.05) with increasing concentrations of dietary mannanase. Pigs fed diets containing increasing levels of mannanase had improved ATTD of DM and CP (quadratic, P < 0.05). In Exp. 2, 64 finisher pigs (initial BW, 92.7 kg) were allotted to 4 treatment groups with 4 pigs per pen and 4 pens per treatment. Pigs were fed corn-soybean meal-based diets containing 15% DDGS and 0, 200, 400, or 600 U of mannanase/kg. Linear increases (P < 0.05) in ADG, blood glucose, and ATTD of DM, GE, and CP were observed with increasing levels of dietary mannanase supplementation. In Exp. 3, 208 grower pigs (initial BW, 60.5 kg) were allotted to 4 treatment groups with 13 pigs per pen and 4 pens per treatment. Pigs were fed diets containing 0 or 10% DDGS and 0 or 400 U of mannanase/kg in a 2 x 2 factorial arrangement. An increase (P < 0.05) in ADG and blood glucose for pigs fed diets containing mannanase was observed. The ATTD of DM and CP (P < 0.05) was decreased with the inclusion of DDGS, whereas pigs fed the mannanase-supplemented diets had an increased (P < 0.05) ATTD of CP. In Exp. 4, 208 finisher pigs (initial BW, 86.5 kg), with 13 pigs per pen and 4 pens per treatment, were fed diets containing 0 or 15% DDGS and 0 or 400 U of mannanase/kg in a 2 x 2 factorial arrangement. The ADG and blood glucose increased (P < 0.05) when mannanase was included in the diets. The ATTD of DM (P < 0.05), GE (P < 0.10), and CP (P < 0.05) increased by the supplementation with mannanase in the diets of finisher pigs. The carcass characteristics and meat quality were not affected by the DDGS or mannanase inclusion. These results indicated that including 10 and 15% DDGS in conventional swine grower and finisher diets had no detrimental effects on growth performance or carcass characteristics. In addition, supplementation with 400 U of mannanase/kg to diets containing 10 and 15% DDGS fed to grower and finisher pigs may improve growth performance and the ATTD of CP.

Effects of mannan level and β-mannanase supplementation on growth performance, apparent total tract digestibility and blood metabolites of growing pigs

“…Rainbird et al (1984) noticed that supplementing β-mannanase resulted in a decrease in glucose and water absorption in pigs. Present findings are consistent with data reported by Yoon et al (2010) and Kim et al (2013) who observed increase in blood glucose concentrations but no effects on the total cholesterol and triacylglycerides in pigs fed diets supplemented with β-mannanase. In contrast to the report by Yoon et al (2010), Kim et al (2013) and the present results, Jo et al (2012) reported that dietary inclusion of enzyme blend containing β-mannanase to the corn-SBMbased simple diet or complex diet had no effects on blood glucose concentrations.…”

“…1 is in good agreement with data reported by Yoon et al (2010) and Kim et al (2013) who observed improvement in ADG of pigs fed diets supplemented with increasing levels of β-mannanase. The main reason that could have contributed to the influence of β-mannanase enzyme may be due to the mannan hydrolysis which can increase permeability of the cell walls and cut the long-chain polysaccharides to improve the digestibility of nutrients.…”

“…In addition, β-mannan also stimulates innate immunity, potentially leading to unnecessary energy expenditure and Kim, Ingale, Hosseindoust, Lee, Lee and Chae less efficient nutrient utilization (Jackson et al, 2003). The lack of an effect on ADFI of β-mannanase in the present experiments is in agreement with previous experiments (Jacela et al, 2010;Yoon et al, 2010). The improved growth performance of growing pigs fed diet supplemented with β-mannanase found in these trials might be partly due to enhanced digestibility of DM, GE and β-mannan, which was in agreement with Kim et al (2013) who reported higher final BW, digestibility of DM and GE in β-mannanase supplemented diet.…”

“…The produced volatile fatty acids during fermentation of dietary NSP, play a role to be used as an energy resource instead of blood glucose (Rerat, 1996). In the current study, high mannan level did not change blood glucose, however, some other studies reported that the high mannan level in the diets reduce the absorption of glucose (Rainbird et al, 1984;Yoon et al, 2010). The ability of glucomannan to lower blood glucose appears related to its viscous and soluble nature (Vuksan et al, 1999).…”

“…Improvement of the ATTD of DM and GE by β-mannanase in the present experiments is consistent with report by Radcliffe et al (1999) who observed improvement of the ATTD of DM and GE in pigs fed diets supplemented with β-mannanase. Similarly, Yoon et al (2010) reported that dietary supplementation of β-mannanase to the corn-SBM and distiller dried grains with solubles-based diet led to an increase in ATTD of DM and CP, but had no effect on ATTD of GE in growing pigs. Contrary to the present results, Pettey et al (2002) observed no effect of β-mannanase on ATTD of DM and GE in pigs.…”