Table 1 Fermentative profile, lactic acid bacteria population (LAB) and dry matter recovery (DMR) of BRS Capiaçu elephant grass silage, harvested at different regrowth ages and residue heights. 1NH3-N = ammonia nitrogen in g/kg of total nitrogen, DM = dry matter, WSC = water-soluble carbohydrates. 2SEM = standard error of mean. 3A = regrowth age, H = residue height. NH3-N: aY = -4.03x + 106.85, R2 = 0.54. Propionic acid: bY = -0.488x + 3.215, R2 = 0.75, cY = -0.814x + 4.575, R2= 0.94. DMR: dY = 2.56137x + 643.17, R2= 0.75. Different letters in column indicate a difference between residue heights by PDIFF (P < 0.05).

From: Biomass production and silage quality of ensiled BRS Capiaçu elephant grass at different regrowth ages and residue heights

Item1

Heights (cm)

Ages (days)

Average

SEM2

p-value3

75

90

105

120

A

H

A × H

Linear

Quadratic

pH

10

3.46

3.58

3.49

3.53

3.51b

0.0428

0.4903

0.0047

0.2419

-

-

50

3.62

3.59

3.58

3.59

3.59a

Average

3.54

3.58

3.54

3.56

 

NH3-N (g/kg TN)

10

99.9

99.2

103.5

85.0

96.90

4.8294

0.0248

0.9427

0.843

0.0198a

0.1095

50

102.5

96.4

99.7

88.0

96.60

Average

101.2

97.8

101.6

86.5

 

Lactic acid (g/kg DM)

10

59.56

50.05

42.51

48.43

50.14

5.6876

0.2408

0.4345

0.5338

-

-

50

49.48

51.43

46.51

40.35

46.94

Average

54.52

50.74

44.51

44.39

 

Acetic acid (g/kg DM)

10

4.95

5.48

3.81

4.96

4.80

0.7102

0.1771

0.3457

0.2023

-

-

50

5.26

4.87

4.47

2.64

4.31

Average

5.10

5.18

4.14

3.80

 

Propionic acid (g/kg DM)

10

2.83

2.35

1.22

1.58

2.00

0.2330

< 0.0001

0.0051

0.0124

0.0003b

0.0898

50

3.59

3.04

2.46

1.07

2.54

< 0.0001c

0.0933

Average

3.21

2.69

1.84

1.33

   

Butyric acid (g/kg DM)

10

0.57

0.93

0.23

0.80

0.65

0.2325

0.6191

0.6986

0.4217

-

-

50

0.80

0.71

0.74

0.61

0.71

Average

0.69

0.82

0.51

0.71

 

WSC (g/kg DM)

10

9.56

6.46

8.78

7.81

8.15

2.1825

0.2311

0.6208

0.7159

-

-

50

8.95

4.01

7.06

9.72

7.44

Average

9.25

5.23

7.92

8.76

 

LAB (log10 cfu/g)

10

5.42

6.08

5.44

6.00

5.74

0.2270

0.1129

0.1037

0.5910

-

-

50

5.26

5.59

5.48

5.54

5.46

Average

5.34

5.84

5.46

5.77

 

DMR

10

823.3

860.9

925.3

934.1

885.9

12.0694

< 0.0001

0.1241

0.8812

< 0.0001d

0.1961

50

841.3

881.0

927.6

949.6

899.9

Average

832.3

870.9

926.4

941.9

 
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