. 2020 Jul 31;62(4):485–494. doi: 10.5187/jast.2020.62.4.485

Table 4. Effects of intravenous infusions of amino acid on the concentrations (µmol/L) of amino acids (AA) in blood plasma of Holstein dairy cows.

Item	Treatment¹⁾				SED	p-value
Item	Control	4AA	no-Met	no-Lys	SED	p-value
Essential AA
Arginine	92	92	89	80	9.8	0.601
Histidine	65	58	65	63	6.0	0.591
Isoleucine	111^a	162^ab	208^b	197^b	26.4	0.038
Leucine	151	140	158	143	17.4	0.737
Lysine	81^a	121^ab	162^b	82^a	21.5	0.026
Methionine	30^a	52^ab	29^a	68^b	14.0	0.083
Phenylalanine	49	44	51	46	5.7	0.681
Threonine	215^b	197^a	186^a	194^a	6.4	0.017
Valine	209^a	302^b	367^b	346^b	37.3	0.021
Non-essential AA
Alanine	170	165	178	154	23.0	0.754
Aspartic acid	12	10	14	13	3.2	0.626
Cysteine	24	26	27	32	3.5	0.199
Glycine	246	211	244	230	28.8	0.627
Glutamic acid	126	130	144	144	17.1	0.649
Proline	76	65	68	68	11.2	0.804
Serine	74	64	69	69	9.4	0.556
Tyrosine	49	39	42	42	5.5	0.335

¹⁾

Control, no infusion; 4AA, mixture of 6 g/d methionine, 19.1 g/d lysine, 13.8 g/d isoleucine and 15.4 g/d valine; no-Met, mixture without methionine; no-Lys, mixture without lysine.

^a-c

Means with different letters within a row differ at p < 0.05.

SED, standard error of the differences.