Correction to: The effect of dietary tryptophan levels on oxidative stress of liver induced by diquat in weaned piglets

Correction to: J Anim Sci Biotechnol. 5, 49 (2014)

https://doi.org/10.1186/2049-1891-5-49

Following publication of the original article [1], it was found that the Table 3 (the data of Plasma urea nitrogen) and Table 4 (the data of Plasma SOD and MDA) are incorrect.

Table 3.

Effects of dietary tryptophan levels and diquat injection on the concentrations of tryptophan, large neutral amino acids (LNAA) and urea nitrogen in the plasma of the weaned piglets

Item	- diquat			+ diquat			SEM	P
	Trp 0.18%	Trp 0.30%	Trp 0.45%	Trp 0.18%	Trp 0.30%	Trp 0.45%		Trp	diquat	Trp × diquat
Tryptophan, nmol/mL	45b	50b	61a	29c	40b	44b	4	<  0.05	<  0.05	0.08
LNAA, nmol/mL	497b	411c	453bc	582a	447bc	421c	17	<  0.05	0.05	<  0.05
Tryptophan/LNAA	0.09b	0.13a	0.14a	0.05c	0.09b	0.11ab	0.01	<  0.05	<  0.05	0.67
Plasma urea nitrogen, mg/L	108.46b	75.30c	76.21c	134.53a	67.11c	74.75c	5.90	<  0.05	0.29	<  0.05

+ diquat, intraperitoneal injection diquat; − diquat, intraperitoneal injection of sterile 0.9% NaCl solution; Trp 0.18%, dietary tryptophan level 0.18%; Trp 0.30%, dietary tryptophan level 0.30%; Trp 0.45%, dietary tryptophan level 0.45%; LNAA, large neutral amino acids (sum of valine, methionine, isoleucine, leucine, phenylalanine, tyrosine and histidine). ^{a, b, c}Mean values with unlike superscript letters were significantly different (P <  0.05). (Mean values with their pooled standard errors, n = 6)

Table 4.

Effects of dietary tryptophan levels and diquat injection on the activities of antioxidant enzymes and the malondialdehyde concentration in the plasma and liver of the weaned piglets

Item	- diquat			+ diquat			SEM	P
	Trp 0.18%	Trp 0.30%	Trp 0.45%	Trp 0.18%	Trp 0.30%	Trp 0.45%		Trp	diquat	Trp × diquat
Plasma
SOD, U/mL	131.55	130.60	131.37	121.26	135.07	129.65	7.13	0.71	0.69	0.64
GPx, U/mL	698.32b	811.76a	810.08a	665.55b	768.24ab	748.07ab	38.60	0.62	0.08	0.66
MDA, nmol/mL	2.28	2.48	2.43	2.41	2.28	2.31	0.26	0.89	0.60	0.97
Liver
SOD, U/mL	564.43a	579.77a	595.80a	469.14b	516.04ab	527.69ab	31.64	0.74	<  0.05	0.09
GPx, U/mL	95.63a	95.71a	95.56a	76.04b	90.03a	99.44a	5.20	0.18	<  0.05	0.05
MDA, nmol/mL	1.60a	1.27b	1.56a	1.74a	1.44ab	1.59a	0.14	0.23	0.09	0.06

+ diquat, intraperitoneal injection diquat; − diquat, intraperitoneal injection of sterile 0.9% NaCl solution; Trp 0.18%, dietary tryptophan level 0.18%; Trp 0.30%, dietary tryptophan level 0.30%; Trp 0.45%, dietary tryptophan level 0.45%; SOD, superoxide dismutase; GPx, Glutathione peroxidase, MDA, Malondialdehyde. ^{a, b, c}Mean values with unlike superscript letters were significantly different (P < 0.05). (Mean values with their pooled standard errors, n = 5 or 6)

The correct tables are provided below:

The original paper has been updated.