Table 8 Intestinal morphology, immune and oxidative stress status of growing pigs fed low CP diets with additional L-Trp supplementation (Exp. 1)

Duodenum

 Villus height, µm

480^b

491^a

492^a

2

0.004

 Villus width, µm

169

170

172

1

0.352

 Crypt depth, µm

371

373

374

3

0.324

 VH:CD ratio⁴

1.29

1.31

1.32

0.01

0.107

 TNF-α, pg/mg of protein

11.36^B

9.82^A

9.54^A

0.52

0.072

 Protein carbonyl, nmol/mg of protein

3.87

3.82

3.54

0.16

0.488

Jejunum

 Villus height, µm

368^c

372^b

380^a

1

 < 0.001

 Villus width, µm

120

123

123

1

0.273

 Crypt depth, µm

252^b

256^a

257^a

1

0.008

 VH:CD ratio⁴

1.46^AB

1.45^B

1.48^A

0.01

0.088

 TNF-α, pg/mg protein

7.60^B

6.42^A

5.79^A

0.71

0.063

 Protein carbonyl, nmol/mg of protein

3.95

3.92

3.69

0.18

0.664