. 2010 Jul;140(7):1242–1248. doi: 10.3945/jn.110.125658

TABLE 3.

Serum concentrations of amino acids on d 60, 80, 110, and 140 of pregnancy in ewes fed 100% NRC, 50% NRC, or 50% NRC + Arg diets¹

	Treatment (T)			Day (D)					P-values
Amino acid	100% NRC	50% NRC	50% NRC+ Arg	60	80	110	140	SEM	T	D	T × D
	μmol/L
Aspartate	7.9^a	4.6^b	6.0^ab	5.6^b	7.3^a	5.6^b	6.1^ab	0.9	0.014	0.044	0.029
Glutamate	120	93	98	177^a	106^b	81^c	51^d	13	0.086	0.001	0.494
Asparagine	30^a	18^b	23^b	25	25	24	20	4	0.001	0.331	0.685
Serine	79^a	58^b	71^ab	72	76	69	61	8	0.049	0.101	0.186
Glutamine	232	173	193	125^b	202^a	226^a	244^a	22	0.070	0.001	0.099
Histidine	43^a	27^b	34^b	35	37	31	35	4	0.003	0.282	0.804
Glycine	394	381	442	362^b	379^b	409^ab	472^a	58	0.548	0.042	0.451
Threonine	105^a	28^b	36^b	71^a	65^a	53^ab	37^b	14	0.001	0.008	0.097
Citrulline	261^a	159^b	190^b	182^b	267^a	186^b	179^b	24	0.001	0.001	0.039
Arginine	295^a	178^b	300^a	204^c	301^a	265^b	262^b	26	0.001	0.001	0.004
β-Alanine	13	7.9	9.4	9.8	9.9	9.8	11	2	0.057	0.704	0.526
Taurine	142^a	77^b	92^b	48^c	144^a	110^b	113^b	17	0.001	0.001	0.759
Alanine	178^a	118^b	149^ab	148	163	133	149	16	0.010	0.055	0.015
Tyrosine	52^a	27^b	33^b	33^b	41^a	36^ab	40^a	4	0.001	0.013	0.537
Tryptophan	40^a	22^b	26^b	30^b	38^a	27^b	21^c	3	0.001	0.001	0.177
Methionine	17^a	7.5^c	10^b	11	11	12	12	2	0.001	0.413	0.468
Valine	162^a	77^b	106^b	117^a	140^b	101^a	102^a	15	0.001	0.001	0.013
Phenylalanine	46^a	28^b	36^b	28^b	38^a	38^a	44^a	4	0.002	0.001	0.650
Isoleucine	81^a	51^c	70^b	51^c	65^b	70^b	84^a	6	0.001	0.001	0.033
Leucine	126^a	75^c	102^b	82^c	115^a	98^b	109^ab	11	0.002	0.001	0.451
Ornithine	108^a	42^c	65^b	64^b	102^a	66^b	55^b	11	0.001	0.001	0.261
Lysine	127^a	69^b	89^b	62^b	113^a	101^a	103^a	31	0.001	0.001	0.028
Cysteine²	167^a	112^c	133^b	121^c	180^a	135^b	113^d	6	0.001	0.001	0.001
Proline	145^a	95^c	123^b	115^b	122^a	122^a	125^a	6	0.001	0.006	0.001

Data are means with pooled SEM, n = 15 observations/d (5 ewes × 3 treatments) and n = 20 observations/treatment (5 ewes × 4 d). Means in a row with superscripts without a common letter differ, P < 0.05 with regard to effects of treatment (T), day (D), or treatment × day (T × D) interaction.

Cysteine + 1/2 cystine.