Table 4.

Plasma AA concentrations (μM) on day 21 for nursery pigs fed low CP diets with reduced concentrations of Gly and Ser and supplemental Thr or Glu

	Dietary Treatment1						P-value
	CON	G1	G2	T1	T2	SEM2	Dietary treatment3
Essential AA
Arg	182	176	184	211	274	83	0.914
His	70	58	67	81	61	7	0.138
Ile	86	76	78	77	73	6	0.633
Leu	123	123	123	121	116	7	0.954
Lys	227	198	149	188	163	19	0.061
Met	46	56	50	62	49	5	0.149
Phe	55	53	49	50	52	3	0.604
Thr	457c	416c	334c	2,927b	4,978a	247	<0.001
Trp	48	45	50	54	58	5	0.273
Val	261	252	246	260	254	11	0.869
NEAA
Ala	527	572	549	592	568	39	0.806
Asn	27	41	37	44	43	12	0.850
Asp	4	9	10	8	6	3	0.386
Cys	4	4	4	4	5	1	0.601
Gln	352	396	424	436	379	75	0.934
Glu	168	216	210	231	213	18	0.158
Gly	2,593a	2,062a	1,224b	2,036a	1,478b	158	<0.001
Pro	197	229	213	217	216	27	0.949
Ser	150	117	92	141	117	34	0.775
Tyr	66	57	60	66	53	4	0.186

¹CON, control; G1, Gly supplied at 60% of CON and replaced with Glu; G2, Gly supplied at 20% of CON and replaced with Glu; T1, Gly supplied at 60% of CON and replaced with Thr; T2 Gly supplied at 20% of CON and replaced with Thr.

²Maximum value of the standard error of the means.

³ P-value for one-way ANOVA.

^a-cMeans followed by different superscripts in the same row are different according to a Tukey’s multiple range test (P < 0.05).