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Table 3 The effect of different feeding regimens, protease supplementation, or their interaction on the economic efficiency

From: Effects of different feeding regimens with protease supplementation on growth, amino acid digestibility, economic efficiency, blood biochemical parameters, and intestinal histology in broiler chickens

Item Feeding regimens Protease level Feeding regimens × Protease level P-value SEM
FR1 FR2 FR3 − VE + VE FR1 − VE FR1 + VE FR2 − VE FR2 + VE FR3 − VE FR3 + VE FR Protease Interaction
Total return (USD)/bird 2.98 2.93 2.94 2.99 2.91 3.01 2.96 2.99 2.86 2.98 2.89 0.81 0.26 0.90 0.03
Net profit (USD) 1.23 1.20 1.18 1.24 1.17 1.24 1.22 1.23 1.17 1.23 1.13 0.85 0.37 0.89 0.03
Total costs (USD) 1.75 1.72 1.75 1.75 1.73 1.76 1.74 1.75 1.68 1.74 1.76 0.49 0.28 0.40 0.01
Feed costs (USD) 1.27 1.24 1.27 1.28 1.25 1.28 1.26 1.28 1.21 1.27 1.28 0.49 0.28 0.40 0.01
Economic efficiency 0.96 0.97 0.92 0.96 0.94 0.96 0.96 0.96 0.97 0.97 0.88 0.78 0.59 0.73 0.02
Feed cost/kg gain (USD) 0.64 0.64 0.65 0.64 0.65 0.64 0.64 0.64 0.64 0.64 0.67 0.75 0.69 0.63 0.01
Performance index% 127.29 122.35 111.15 124.38 116.14 128.11 126.46 124.10 120.59 120.92 101.37 0.15 0.21 0.48 3.26
  1. FR1: recommended protein corn-SBM diet; FR2: low-protein SBM diet; FR3: low-protein SBM/DDGS-SFM diet; FR1 − VE: recommended protein SBM diet without protease supplementation; FR1 + VE: recommended protein SBM diet + protease supplementation; FR2 − VE: low-protein SBM diet without protease supplementation; FR2 + VE: low-protein SBM diet + protease supplementation; FR3 − VE: low-protein SBM/DDGS-SFM diet without protease supplementation, FR3 + VE: low-protein SBM/DDGS-SFM diet + protease supplementation