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. 2017 Dec;95(12):5474–5484. doi: 10.2527/jas2017.1964

Table 3.

Apparent total tract digestibility (ATTD) of total dietary fiber (TDF), IVDMD, and kinetics of gas production of 3 insoluble dietary fiber ingredients: wheat straw (WS), soybean hulls (SBH), and corn distiller's dried grains with solubles (DDGS)1

Item ATTD of TDF, % IVDMDh,2 % IVDMDf,3 % IVDMDt,4 % A5 B6 C7
WS 26.7c 13.3c 23.3c 33.5b 121c 21.3ab 1.98a
SBH 78.9a 18.9b 84.6a 88.9a 412a 20.0b 2.15a
Corn DDGS 43.0b 53.7a 69.6b 86.1a 317b 22.6a 1.45b
SEM 2.24 0.24 1.83 1.46 11.7 1.03 0.12
P-value <0.01 <0.01 <0.01 <0.01 <0.01 0.04 <0.01
WS
    1 24.2 13.8A 18.7B 30.0B 100 18.8B 2.03
    2 29.4 12.8B 24.3AB 33.9AB 141 23.3A 1.94
    3 26.4 13.4AB 26.8A 36.5A 122 21.9AB 1.97
    SEM 1.75 0.16 1.40 0.94 9.81 0.93 0.09
    P-value 0.52 0.05 0.03 0.02 0.19 0.05 0.91
SBH
    4 79.0 17.0C 86.8 92.4x 407 20.2 2.31
    5 75.0 20.5A 84.1 88.1xy 412 18.7 2.10
    6 82.7 19.0B 82.9 86.2y 419 21.0 2.05
    SEM 1.49 0.17 1.37 1.03 9.29 0.88 0.08
    P-value 0.12 <0.01 0.43 0.06 0.83 0.42 0.39
Corn DDGS
    7 43.1AB 52.0B 70.0 86.6 335 26.0A 1.43
    8 49.8B 52.1B 71.0 86.1 313 21.4B 1.46
    9 36.0A 56.9A 67.7 85.8 305 20.4B 1.47
    SEM 1.49 0.19 1.45 1.13 9.46 0.90 0.08
    P-value <0.01 <0.01 0.58 0.96 0.33 <0.01 0.98
a–c

Means among ingredients with different superscripts differ (P ≤ 0.05).

A–C

Means within different sources of the same ingredient with different superscripts differ (P ≤ 0.05).

x,y

Means within different sources of the same ingredient with different superscripts tended to differ (0.05 < P < 0.1).

1

Data were expressed as means. There were 8 observations of each measurement.

2

IVDMDh = in vitro DM disappearance from simulated gastric and small intestinal hydrolysis.

3

IVDMDf = in vitro DM disappearance from simulated large intestine fermentation.

4

IVDMDt = in vitro DM disappearance from simulated total tract digestion.

5

A = asymptotic gas production (mL/g DM substrate).

6

B = the time after incubation at which half of the asymptotic amount of gas has been formed (h).

7

C = a constant determining the sharpness of the switching characteristic of the profile.