Effect of a carbohydrase enzyme complex on the nutrient apparent total tract digestibility of rye-based diets fed to growing-finishing pigs under liquid feeding

A trial was conducted to evaluate the efficacy of a carbohydrase enzyme complex under liquid feeding conditions in pigs fed a rye-based diet. One hundred and forty-four pigs (in 36 pens; 29 kg BW; 1/2 males and 1/2 females) were fed 2 diets consisting of a rye-based basal diet (Control; without enzyme) and the same diet supplemented with 100 mg/kg of an enzyme complex (Enzyme). The enzyme complex used (Ronozyme MultiGrain, DSM Nutritional Products, Basel, Switzerland) is derived from Trichoderma reesei and has endo-1,4-beta-glucanase (EC 3.2.1.4; 800 U/g), endo-1,3(4)-beta-glucanase (EC 3.2.1.6; 700 U/g), and endo-1,4-beta-xylanase (EC 3.2.1.8; 2,700 U/g) activities. Pigs' performance was evaluated for 98 d, and nutrient apparent total tract digestibility (ATTD) at 56 and 98 d of trial was evaluated using acid insoluble ash as an indigestible marker. At 56 d of trial, the basal diet contained 50% rye, and the enzyme supplementation improved (P < 0.01) ATTD for DM (79.8 vs. 83%), CP (72.8 vs. 78%), fat (61.1 vs. 68.6%), GE (79.5 vs. 83.2%), NDF (31.5 vs. 41.6%), and ADF (11.3 vs. 27.6%). At 98 d of trial, the basal diet contained 70% rye, and enzyme supplementation also improved ATTD for DM (80.4 vs. 82.1%; P < 0.01), CP (73.7 vs. 77.5%; P < 0.01), fat (51.1 vs. 57.0%; P < 0.01), GE (80.6 vs. 82.3%; P < 0.01), and ADF (17.4 vs. 24.6; P < 0.05). It is concluded that the tested enzyme complex improves nutrient ATTD of rye-based diets fed to pigs under liquid feeding.