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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)