Table 5.

Effect of β-alanine on the metabolic concentration of amino acids in the plasma of Yili horses in the immediate post-race period (μmol/L).

Items	Control groups	Test groups
Gly	431.67 ± 254.72	412.33 ± 84.91
Ala	446.17 ± 92.74	358 ± 88.14
Gln	305.33 ± 43.27	308.5 ± 21.68
Val	255.17 ± 36.65A	194.67 ± 24.41B
Ser	177.33 ± 12.64	162.17 ± 22.09
Pro	112.07 ± 19.66	107.35 ± 10.61
Leu	113.33 ± 9.07	99.80 ± 17.63
Arg	80.70 ± 7.78	96.77 ± 18.39
Cit	76.33 ± 41.93	53.28 ± 5.83
Lys	90.9 ± 14.73	82.40 ± 18.00
Orn	61.93 ± 10.09	72.52 ± 15.70
Ile	68.52 ± 11.04	58.82 ± 8.56
His	53.67 ± 6.82	54.10 ± 10.43
Thr	61.73 ± 7.68	61.3 ± 10.94
Phe	48.5 ± 4.31	53.4 ± 5.22
Tyr	42.72 ± 4.69	47.83 ± 5.37
Trp	34.15 ± 3.27	29.9 ± 6.44
Glu	41.1 ± 6.53	46.03 ± 15.91
Tau	45.92 ± 14.79	40.5 ± 23.12
β-Ala	4.45 ± 0.81B	27.22 ± 13.51A
Asn	17.65 ± 7.54	17.02 ± 5.84
Met	18.78 ± 1.73	21.57 ± 5.19
Hyp	12.37 ± 2.17	13.43 ± 2.92
Hpro	10.46 ± 5.53	10.63 ± 2.37
3-MHis	7.60 ± 2.14b	12.97 ± 5.34a
Asp	10.86 ± 4.60	8.79 ± 4.71
Car	6.65 ± 2.96B	11.44 ± 1.22A
Abu	2.83 ± 0.88	2.45 ± 0.40
Kyn	2.15 ± 0.45	2.53 ± 0.15
Cys1	1.99 ± 1.73	0.78 ± 0.18
Ans	0.96 ± 0.6	0.83 ± 0.63
EtN	4.54 ± 3.18	5.00 ± 4.53
Harg	1.18 ± 0.4	0.76 ± 0.46
Aad	1.69 ± 2.00	0.76 ± 0.57
Sar	0.69 ± 0.26	0.98 ± 0.29
3-Aib	0.91 ± 0.26	0.84 ± 0.44
5-HT	1.63 ± 1.38	1.60 ± 2.01
Asa	0.18 ± 0.24	0.57 ± 0.41
Hcit	0.19 ± 0.25	0.35 ± 0.35
5-HTP	0.23 ± 0.18	0.36 ± 0.22
PEtN	2.21 ± 3.28	1.11 ± 1.24
5-Ava	0.35 ± 0.40	0.28 ± 0.20
Cth	0.30 ± 0.50	0.13 ± 0.12
Hyl	0.15 ± 0.11	0.09 ± 0.13
GABA	0.25 ± 0.24	0.07 ± 0.11
Hser	0.04 ± 0.06	0.05 ± 0.07

^a,bValues within a row without common superscripts differ significantly (p < 0.05). ^A,BValues in rows with no common superscript, highly significant (p < 0.01).