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Table 2 The effect of different feeding regimens, protease supplementation, or their interaction on the blood biochemical parameters of broiler chickens

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
Methionine 98.74a 98.69b 98.69b 98.72 98.70 98.75a 98.73ab 98.72ab 98.66c 98.68bc 98.71abc 0.006 0.06 0.01 0.007
Lysine 99.14 98.85 98.92 99.07 98.87 99.39 98.89 98.91 98.78 98.90 98.94 0.40 0.29 0.45 0.015
Threonine 98.43 98.47 98.47 98.46 98.45 98.44 98.41 98.51 98.44 98.44 98.50 0.20 0.64 0.15 0.008
Tryptophan 98.76 98.70 98.69 98.74a 98.69b 98.73ab 98.78a 98.77a 98.64b 98.71ab 98.67ab 0.06 0.04 0.02 0.015
Arginine 98.75a 98.68b 98.66b 98.69 98.70 98.75 98.75 98.68 98.67 98.65 98.68 0.00 0.37 0.12 0.004
Isoleucine 86.10a 85.68b 85.41b 85.70 85.76 86.04 86.16 85.81 85.56 85.25 85.56 0.002 0.48 0.08 0.05
Leucine 90.89a 90b 89.94b 90.39a 90.16b 91.05 90.74 90.11 89.88 90 89.88 0.00 0.01 0.52 0.02
Valine 98.55a 98.50b 98.46c 98.50 98.51 98.55 98.55 98.50 98.51 98.45 98.46 0.00 0.53 0.86 0.006
  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
  2. a,b,cMeans within the same row carrying different superscripts are significantly different at (P < 0.05)