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

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	45^b	50^b	61^a	29^c	40^b	44^b	4	< 0.05	< 0.05	0.08
LNAA, nmol/mL	497^b	411^c	453^bc	582^a	447^bc	421^c	17	< 0.05	0.05	< 0.05
Tryptophan/LNAA	0.09^b	0.13^a	0.14^a	0.05^c	0.09^b	0.11^ab	0.01	< 0.05	< 0.05	0.67
Plasma urea nitrogen, mg/L	95.12^c	60.02^d	64.27^d	212.50^a	135.02^b	142.17^b	7.90	< 0.05	< 0.05	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%; 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).

ISSN: 2049-1891