Effect of phytase, carbohydrase, and protease addition to a wheat distillers dried grains with solubles and rapeseed based diet on in vitro ileal digestibility, growth, and bone mineral density of grower-finisher pigs
The use of rapeseed meal (RSM) and wheat distillers dried grains with solubles (wDDGS) in pig diets is increasingand dietary supplementation with exogenous enzymes has been suggested as means of improving feed efficiencyin pigs. The objective of this experiment was to examine the effect of phytase (Phy), a xylanase andβ-glucanasecomplex (XB), protease (Prot) and their various combinations when included in a wDDGS- and RSM-based dietfed to grower-finisher pigs. As the P- and Ca- sparing effect of Phy is well proven, the objective was to examinethe additional effects of Phy beyond its P- and Ca-sparing effects. A total of 144 pigs with an initial live weight of40.1 ± 2.0 kg were assigned to 8 treatments with 9 pens (4 female and 5 male pens) per treatment and 2females or 2 males per pen. The basal diet was formulated to contain 96 and 200 g/kg of RSM and wDDGS,respectively. The basal diet was supplemented with Phy (0 or 100 mg/kg), XB (0 or 100 mg/kg), and Prot (0 or200 mg/kg) in a 2 × 2 × 2 factorial arrangement of treatments. Experimental diets were fed for 76 d. Averagedaily gain (ADG) and average daily feed intake (ADFI) were recorded, and gain to feed (G:F) was calculated.Carcass quality variables were measured at slaughter and the left forelimb of pigs fed the unsupplemented, thePhy supplemented and the Phy + Prot supplemented diets were removed to determine bone mineral density inthe third metacarpal. The inclusion of Phy, XB and Prot in the diets increased in vitro ileal digestibility of drymatter and organic matter (P< 0.05). A tendency towards a 3-way interaction among Phy, XB and Prot wasobserved for ADG (P= 0.06) and G:F (P= 0.06). The 2-way interactions and main effects did not reveal anyimprovement for any variable measured in vivo in response to dietary enzyme supplementation. Bone mineraldensity was not different for pigs fed the unsupplemented, the Phy supplemented and the Phy + Prot supple-mented diets. In conclusion, the in vitro ileal digestibility improvements observed were not always reflected inimprovements in pig growth, feed efficiency or both. The efficacy of Phy was not reduced when supplemented incombination with Prot, as ADG, G:F, carcass quality and bone mineralization were unchanged.
636 - Animal husbandry and breeding in general. Livestock rearing. Breeding of domestic animals
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Torres-Pitarch, A., U.M. McCormack, V.E. Beattie, E. Magowan, G.E. Gardiner, A.M. Pérez-Vendrell, D. Torrallardona, J.V. O'Doherty, and P.G. Lawlor. 2018. "Effect Of Phytase, Carbohydrase, And Protease Addition To A Wheat Distillers Dried Grains With Solubles And Rapeseed Based Diet On In Vitro Ileal Digestibility, Growth, And Bone Mineral Density Of Grower-Finisher Pigs". Livestock Science 216: 94-99. Elsevier BV. doi:10.1016/j.livsci.2018.07.003.
Grant agreement number
EC/FP7/311794/EU/A whole-systems approach to optimising feed efficiency and reducing the ecological footprint of monogastrics/ECO-FCE
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