Table 2 Chemical composition of the pasture subareas, given as arithmetic mean and standard deviation (n = 4 in subarea 1 and 2, n = 3 in subarea 3).

From: Feed intake, digestibility and passage kinetics in grazing horses

Item

Subarea 1

Subarea 2

Subarea 3

DM (g/kg)

188 ± 10.4

225 ± 8.73

196 ± 6.02

Crude ash (g/kg DM)

80 ± 6.8

83 ± 7.3

93 ± 4.2

CP (g/kg DM)

178 ± 24.4

162 ± 12.1

124 ± 17.1

Pre-caecal digestible CP (g/kg DM)1

93 ± 8.3

74 ± 7.9

52 ± 8.5

Lysine (g/kg DM)

8.8 ± 1.6

7.5 ± 0.26

5.9 ± 0.77

Pre-caecal digestible lysine (g/kg DM)1

4.6 ± 0.72

3.5 ± 0.36

2.5 ± 0.37

SAA (g/kg DM)2

4.4 ± 0.62

3.8 ± 0.039

3.2 ± 0.40

Pre-caecal digestible SAA (g/kg DM)1

2.2 ± 0.25

1.8 ± 0.17

1.3 ± 0.20

Threonine (g/kg DM)

7.8 ± 1.3

7.0 ± 0.076

5.8 ± 0.72

Pre-caecal digestible threonine (g/kg DM)1

4.0 ± 0.56

3.3 ± 0.30

2.4 ± 0.34

Tryptophan (g/kg DM)

2.6 ± 0.41

2.2 ± 0.077

1.8 ± 0.31

Acid ether extract (g/kg DM)

25 ± 2.4

22 ± 2.9

19 ± 0.071

Crude fibre (g/kg DM)

301 ± 19.1

312 ± 13.9

306 ± 11.1

aNDFom (g/kg DM)

659 ± 9.53

669 ± 20.7

628 ± 40.7

ADFom (g/kg DM)

336 ± 6.66

348 ± 17.0

355 ± 8.74

ADL (g/kg DM)

31 ± 2.3

36 ± 3.8

35 ± 3.4

Glucose (g/kg DM)

5.9 ± 4.6

4.2 ± 1.7

3.9 ± 1.2

Fructose (g/kg DM)

24 ± 11

33 ± 19

41 ± 11

Mannitol (g/kg DM)

1.8 ± 0.57

0.93 ± 1.2

2.2 ± 0.47

Fructans (g/kg DM)

10 ± 2.0

11 ± 4.4

24 ± 8.0

Gross energy (MJ/kg DM)

18.5 ± 0.399

18.7 ± 0.465

18.0 ± 0.392

ME (MJ/kg DM)3

6.9 ± 0.51

6.7 ± 0.31

6.7 ± 0.37

ME (MJ/kg DM)4

7.3 ± 0.49

7.0 ± 0.35

6.9 ± 0.30

Phosphorus (g/kg DM)

3.5 ± 0.27

3.2 ± 0.29

2.8 ± 0.27

Calcium (g/kg DM)

4.4 ± 0.93

4.4 ± 0.82

4.8 ± 0.80

Potassium (g/kg DM)

19 ± 3.2

22 ± 2.6

25 ± 2.5

Sodium (g/kg DM)

0.8 ± 0.5

0.2 ± 0.041

0.5 ± 0.087

Magnesium (g/kg DM)

1.6 ± 0.25

1.2 ± 0.19

1.3 ± 0.056

Zinc (mg/kg DM)

22 ± 3.7

23 ± 5.9

21 ± 2.5

Manganese (mg/kg DM)

39 ± 7.5

37 ± 9.3

52 ± 15

Copper (mg/kg DM)

9.5 ± 0.64

9.9 ± 1.4

13.3 ± 1.20

Iron (mg/kg DM)

137 ± 60.9

117 ± 45.6

86 ± 7.1

  1. AA amino acids, ADFom acid detergent fibre expressed exclusive of residual ash, ADL acid detergent lignin, aNDFom neutral detergent fibre assayed with amylase and expressed exclusive of residual ash, CP crude protein, DM dry matter, ME metabolizable energy, SAA sulphurous AA.
  2. 1Calculated according to GfE26 and Zeyner et al.29.
  3. 2Sum of methionine and cysteine.
  4. 3Calculated according to GfE26 and Kienzle and Zeyner30 with static consideration of renal energy losses.
  5. 4Calculated according to Kuchler et al.31 with dynamic consideration of renal energy losses.
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