Growth performance and nutrient digestibility of broiler chickens as affected by a novel protease

Two experiments evaluated the addition of an exogenous sfericase protease in broiler diets. Experiments were run (Exp1 and Exp2) with 1,848 2,100 one-day-old male chicks being allocated into 84 floor pens 14 replicates 22 25 birds each, respectively. The studies conducted completely randomized designs. In Exp1, Standard diets formulated energy AA at marginally lower levels than usual by Brazilian integration such that broilers expected to grow comparatively reduced rates industry whereas Exp2, using as integrations comparable rates. had ideally balanced amino acids (AA). Matrix diets, contrast, reductions 6% digestible lysine 20 kcal AME/kg compared Standard. supplemented 0, 10,000, 30,000 New Feed Protease units (NFP)/kg. Outcomes showed no interaction between diet any experiments. However, fed higher cumulative body weight gain (BWG) 35 42 d when FCR worse for EXP1 EXP2. Improvements observed was added throughout all ages a beneficial trend (P<0.067) ileal crude protein (IDCP) significantly feeds other differences digestibility found led improvements dry matter (IDM) IDCP (P < 0.05) well (IDE) added. present report demonstrates novel successful compensate performance Lys kcal/kg AME imposed. This compensation, however, seemed more notable support moderate rather maximum growth having animal feed formula.