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Table 2 Effect of dietary crude protein source and level on growth performance, protein deposition, and N balance of finishing gilts (90–113 kg, n = 6)

From: Influences of dietary protein sources and crude protein levels on intracellular free amino acid profile in the longissimus dorsi muscle of finishing gilts

Item

Protein source

Protein level

SEM

P

Cottonseed meal

Soybean meal

12 %

14 %

Source

Level

Source × Level

Initial body weight, kg

90.30

88.80

90.30

88.70

1.86

0.58

0.56

0.93

Final body weight, kg

115.40

112.30

114.50

113.10

1.87

0.16

0.48

0.90

Average daily feed intake, kg/d

3.04

2.87

3.02

2.89

0.05

0.03

0.09

0.11

Gain-to-feed ratio

0.29

0.28

0.28

0.29

0.01

0.30

0.63

0.77

Average daily gain, kg/d

0.90

0.81

0.86

0.85

0.03

0.08

0.80

0.66

Total protein depositiona, kg

17.90

17.30

17.70

17.50

0.26

0.15

0.48

0.90

Serum urea nitrogen, mmol/L

7.54

7.19

6.50

8.23

0.45

0.59

0.01

0.24

Daily N intake, g/d

64.63

61.18

58.28

67.54

1.15

0.04

<0.01

0.91

Daily N deposition, g/d

20.43

20.87

20.53

20.76

0.22

0.17

0.47

0.91

Daily N excretion, g/d

44.20

40.30

37.70

46.8

1.31

0.05

<0.01

0.93

N efficiencyb, kg/kg

0.32

0.35

0.35

0.31

0.01

0.06

<0.01

0.90

  1. aCalculated from Eq.2 and Eq.6
  2. bComputed as (daily N deposition / daily N intake)