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Extrusion technology has been successfully employed to improve the nutritive value of full fat seeds via deactivation of the anti-nutritive factors. However, the fibrous portion of the seeds is largely intact following extrusion and application of enzymes targeting non-starch polysaccharides of the fiber fraction might improve the nutritive value of full fat seeds further. This notion was investigated in a study involving 6-ileal cannulated barrows (average initial BW = 75 kg) fed extruded full fat soybean (FFSB) without or with a multi-carbohydrase enzyme (CE) to determine apparent ileal digestibility (AID) of energy and standardized ileal digestibility (SID) of AA. The CE supplement provided 500 units pectinase, 50 units cellulase, 400 units mannanase, 1,200 units xylanase, 450 units glucanase and 45 units galactanase per Kg of diet. A basal diet was formulated to contain FFSB as the sole source of AA; the CE diet was made by supplementing the basal diet with CE. All diets had titanium oxide as an indigestible marker. Diets were fed in a 2-period crossover design to give 6 observations per diet. Each experimental period lasted 7d; 5d adaptation period and 2d ileal digesta collection. The SID of N and AA were calculated using published values from our laboratory.
CE supplementation increased (P < 0.01) the AID values of DM (69 vs. 66%), GE (75 vs. 71%) and N (64 vs. 58%). The CE supplemented diet had higher (P < 0.05) AID values for Leu, Lys, Met+Cys, Thr, Cys, Ser and Tyr than the basal diet. Compared with the basal diet, the CE supplemented diet had higher (P < 0.01) SID value for N (74 vs. 69%) and higher (P < 0.05) SID values for Lys (73 vs. 69%), Met (63 vs. 57%), Met+Cys (60 vs. 52%) and Thr (66 vs. 61%). The average SID for indispensable and total AA increased (P < 0.1) by 3 and 4 percentage units respectively.
In conclusion, CE supplementation increased the nutritive value of extruded FFSB for finishing pigs.
D Ayoade, E Kiarie, B Slominski, CM Nyachoti. 2011. Effect of a multi-carbohydrase enzyme on apparent and standardized ileal amino acid digestibility in extruded full fat soybeans fed to finishing pigs. Journal of Animal Science, 89 (E-Suppl. 2): page 64.
