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Table 1 The effect of protease supplementation to different feeding regimens on the growth performance 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
Initial wt (g) 74.72 72.59 75.41 75.47 73.01 74.62 74.83 75.95 69.22 75.83 75 0.32 0.13 0.16 0.82
Starter period
 BW (g) 206.47 209.15 208.5 210.21 205.87 206.12 206.83 212.58 205.72 211.94 205.05 0.87 0.34 0.72 2.03
 BWG (g) 131.7 136.56 133.08 134.74 132.85 131.5 132 136.62 136.5 136.11 130.05 0.74 0.72 0.86 2.35
 FI (g) 182.25b 186.36b 224.38a 199.15 196.18 182.79 181.72 188.95 183.77 225.72 223.05 0.00 0.49 0.91 4.59
 FCR 1.38b 1.37b 1.68a 1.47 1.48 1.39 1.38 1.38 1.35 1.66 1.71 0.00 0.87 0.66 0.03
Grower period
 BW (g) 897.90a 875.59ab 844.61b 886.62 858.77 897.91 897.88 892.29 858.88 869.66 819.55 0.02 0.05 0.33 8.51
 BWG (g) 691.42a 666.43ab 636.11b 676.40 652.90 691.79 691.05 679.70 653.16 657.72 614.5 0.01 0.07 0.37 7.92
 FI (g) 916.69 940.21 979.83 939.64 951.51 932.16 901.22 921.20 959.22 965.55 994.11 0.31 0.71 0.63 15.29
 FCR 1.32 1.41 1.54 1.39 1.46 1.35 1.30 1.35 1.47 1.46 1.61 0.06 0.27 0.46 0.03
Finisher period
 BW (g) 2046.87 2009.38 2015.36 2054.17 1993.57 2062.75 2031 2054.04 1964.72 2045.72 1985 0.81 0.26 0.90 23.78
 BWG (g) 1148.97 1133.79 1170.75 1167.54 1134.79 1164.83 1133.11 1161.75 1105.83 1176.05 1165.44 0.78 0.45 0.91 19.01
 FI (g) 2077.17 2063.45 2144.33 2134.66 2055.31 2090.29 2064.05 2172.41 1954.5 2141.27 2147.38 0.51 0.19 0.27 29.83
 FCR 1.015 1.026 1.06 1.03 1.03 1.01 1.017 1.05 0.99 1.045 1.081 0.17 0.69 0.16 0.01
Overall performance
 BW (g) 2046.87 2009.38 2015.36 2054.17 1993.57 2062.75 2031 2054.04 1964.72 2045.72 1985 0.82 0.28 0.92 23.78
 BWG (g) 1972.14 1936.79 1939.94 1978.69 1920.55 1988.12 1956.16 1978.08 1895.5 1969.88 1910 0.08 0.27 0.39 23.72
 FI (g) 3176.12 3190.04 3348.55 3273.46 3203.01 3205.25 3147 3282.58 3097.5 3332.55 3364.55 0.08 0.69 0.60 78.90
 FCR 1.61 1.65 1.72 1.65 1.67 1.61 1.61 1.66 1.63 1.6914 1.76 0.25 0.72 0.65 0.04
 PER 2.99 3.08 2.93 3.01 2.99 2.99 2.99 3.06 3.10 2.99 2.87 0.72 0.93 0.68 0.03
 RGR 185.85 186.03 185.56 185.79 185.83 185.97 185.72 185.72 186.34 185.69 185.43 0.32 0.13 0.16 0.20
  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; BW: body weight; BWG: body weight gain; FI: feed intake; FCR: feed conversion ratio; PER: protein efficiency ratio; RGR: relative growth rate
  2. a,bMeans within the same row carrying different superscripts are significantly different at (P < 0.05)