Table 1 Reported correlations between in vivo and in vitro digestibilities since 1955.

[28]

Thurman and Wehunt (1955)

SorghumCorn silage

Rabbits

–

Solution 1% HCl 15 lb pressure 1 h

0.66

–

[29]

Clark (1958)

Thirteen grass species

Sheep

–

Rumen jus

0.87

–

[2]

Tilley and Terry (1963)

CloverLucerne

Sheep

Rumen jus

HCl 0.1 N2 g L⁻¹ pepsin

y = 0.99x − 1.01

[30]

Donefer et al. (1963)

Green grass silage

Sheep

–

Cellulase + pepsin 24 h 40 °C

0.93

–

[14]

Alexander and McGowan (1966)

GrassesLegumesHays

Sheep

Rumen liquor/buffer mixture

HCl–pepsin

0.96

y = 0.97x + 5.05

[31]

Deinum and Soest (1969)

Hays grassesGrass silages

–

–

Rumen jus

0.89

y = 1.28x − 44.8

[32]

Jones and Hayward (1973)

Temperate grasses

Sheep

–

Cellulase Trichoderma viride 6.25 g L⁻¹ 48 h 40 °C

0.92

y = 0.72x + 32.95

[33]

Hartley et al. (1974)

GrassesLegumes

Sheep

NDF [3]

Cellulase basidiomycete 16 h

0.96

–

Rumen jus [2]

37 °CHCl 0.1 N2 g L⁻¹ pepsin [2]

0.96

–

[5]

Jones and Hayward (1975)

Temperate grass

Sheep

HCl 0.1 N–2 g L⁻¹ pepsin 24 h 40 °C

Cellulase “BDH” 48 h 40 °C (Trichoderma viride)

0.96

y = 0.61x + 30.4

[34]

McQueen and Van Soest (1975)

Temperate grassLegumes

Sheep and cattle

45 mg Onozuka cellulase in 6.5 m of 1 M acetate. pH 4.5 40 °C 72 h

70 mg pepsin in 1 mL of 1 M acetate. pH 4.5 40 °C 24 h

0.80

–

Rumen jus [2]

HCl 0.1 N–2 g L⁻¹ pepsin [2]

0.95

–

[35]

Adegbola and Paladines (1977)

Tropical grassesLegumes

Sheep

HCl 0.05 NPepsin 48 h 40 °C

Cellulase Trichoderma (Worthinton Biochemical Corporation) 48 h 40 °C

0.98

–

[36]

Clark and Beard (1977)

Green SilageHaysStraw

Sheep or cattle

HCl 0.1 NPepsin 24 h 40 °C

Cellulase (Aspergillus niger) 48 h 40 °C

0.80

y = 39.1 + 0.76x

[37]

Dowman and Collins (1977)

Grass silage

Sheep

HCl 0.1 NPepsin 24 h 40 °C

Cellulase “BDH” 48 h 40 °C

0.89

y = 0.58x + 31.57

[38]

Goto and Minson (1977)

Tropical and temperate grasses

Sheep

HCl 0.1 NPepsin 48 h 40 °C

Cellulase “Onozuka SS—P” 48 h 40 °C

0.94

y = 0.69x + 20.3

[39]

Roughan and Holland (1977)

Temperate grasses and legumes

–

NDF solution

Cellulase Trichoderma viride 5 h and 18 h 50 °C

0.98

y = 0.98x − 10.12

[2]

Tilley and Terry (1963)

Temperate grasses

Sheep

HCl 0.1 N–2 g L⁻¹ pepsin 24 h 40 °C

Cellulase Trichoclerma viride (“BDH”. phosphate citrate buffer. pH 4.6) 48 h 40 °C

0.96

y = 0.56x + 34.7

[40, 41]

Kellner and Kirchgessner (1977) Kirchgessner and Kellner (1978)

Green silageHaysLegumes

–

HCl 2 N 30 min 100 °C

Cellulase (0.1 M Na-acetate buffer. pH 4.5) 24 h 39 °CHCl 0.1 N—pepsin 2 mg L⁻¹ 48 h

0.91

y = 1.15x − 12.02

[42]

McLeod and Minson (1978)

Tropical and temperate grasses

–

HCl 0.1 NPepsin 48 h 39 °C

Cellulase “Onozuka SS—P 1500” 48 h 39 °C

0.94

y = 0.70x + 18.2

[43]

Adamson and Terry (1980)

Hays

Sheep

HCl 0.1 N2 g L⁻¹ pepsin 24 h 40 °C

Cellulase Trichoclerma viride (“BDH”. phosphate citrate buffer. pH 4.6) 48 h 40 °C

0.91

y = 0.68x + 24.18

[6]

Aufrere (1982)

Green silageHaysLegumes

Sheep

HCl 0.1 N2 g L⁻¹ pepsin 24 h 40 °C

Cellulase Trichoderma viride “Onozuka R 10” (sodium acetate de 0.05 M pH 4.6)24 h at 40 °C

0.91

y = 0.793x + 0.125 + Δ_Forage

[7]

Aufrere (1983)

–

–

HCl 0.1 N2 g L⁻¹ pepsin 24 h 40 °C30 min 80 °C

Cellulase Trichoderma viride “Onozuka R 10” (sodium acetate de 0.05 M pH 4.6)24 h at 40 °C

0.79

–

[8]

Limagrain (1985)

–

–

HCl 0.1 N2 g L⁻¹ pepsin 24 h 40 °C30 min 80 °C

Cellulase “Onozuka R 10” and amyloglucosidase 24 h 40 °C

–

–

[16]

Lila et al. (1986)

Maize silage

Sheep

α-Amylase (A-1278 SIGMA) 39 °C 24 hHCl 1 N20 g L⁻¹ pepsin 39 °C 24 h

Cellulase (Celluclast 200 L type N de Novo. sodium acetate pH 4.8) 50 °C 58 h

0.25

–

[44]

Aufrere and Michalet-Doreau (1988)

Dry forages, dry roughages, energy feeds, protein supplements

Sheep

HCl 0.1 N2 g L⁻¹ pepsin 24 h 40 °C30 min 80 °C

Cellulase Trichoderma viride “Onozuka R 10” (sodium acetate de 0.05 M pH 4.6)24 h at 40 °C

0.95

y = 0.699x + 22.6

[45]

De Boever et al. (1988)

Maize silage

Sheep and cattle

HCl 0.1 N—2 g L⁻¹ pepsin 24 h 40 °C and 45 min 80 °C

Cellulase 24 h 40 °C

0.71

y = 0.610x + 28.2

[15]

Barrière et al. (1991)

Maize silage hybrids

Texels castrated sheep

Aufrère [6]Lila et al. [16]Limagrain–EnsitecLibramont–Limagrain (NIRS prediction)

0.540.290.380.37

––––

[8, 9]

Andrieu et al. (1993) Dardenne et al. (1993)

Maize silage

Sheep

Limagrain [8]

Limagrain [8]

0.537

–

Aufrère [7]

Aufrère [7]

0.613

–

Lila et al. [16]

Lila et al. [16]

0.450

–

[46]

Ferret et al. (1997)

Maize silage

Sheep

Rumen liquor/buffer mixture

HCl–pepsin [14]

0.62

y = 0.75x + 0.1728

[11]

Aufrere (2007)

Green silageSilageHay

Sheep

HCl 0.1 N2 g L⁻¹ pepsin 24 h 40 °C30 min 80 °C

Cellulase Trichoderma viride “Onozuka R 10” (sodium acetate de 0.05 M pH 4.6)

0.78

y = 0.630x + 29.7

[17]

Damiran et al. (2008)

Forages

Sheep

28 mL of the McDougall’s solution and 7 mL of ruminal fluid 39 °C 48 h

HCl 0.1 N—pepsin 6.6 g L⁻¹ 39 °C 48 h(Galyean 1997)

0.58

y = 0.614x + 0.149

[18]

Kowalski et al. (2014)

Grass silage

Sheep

–

Cellulase Trichoderma viride “Onozuka R 10” (sodium acetate de 0.01 M pH 4.6) 39 °C 48 h

0.53

y = 0.527x + 0.356

[12]

Peyrat (2015)

Maize

Sheep and cattle

Aufrère et al. (2007)

Aufrère et al. (2007)

0.736

Y = 37.79x + 0.4936

[13]

Virlouvet et al. (2019)

Maize

–

HCl 0.1 N24 h 40 °C

Cellulase Trichoderma viride “Onozuka R 10” (sodium acetate de 0.05 M pH 4.6)72 h 50 °C

–

–