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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)