Jugular arginine supplementation increases lactation performance and nitrogen utilization efficiency in lactating dairy cows

Table 6 Effects of arginine infusion on free AA concentrations (μmol/L) in plasma of coccygeal artery in dairy cows

Items	Treatments^c			SEM	P-value
Items	Control	Arg group	Ala group	SEM	P-value
Lys	182.23	183.48	176.69	18.15	0.92
Met	65.88	63.30	63.06	11.05	0.96
Leu	322.49	305.12	371.40	43.96	0.32
Ile	187.06	176.20	211.19	23.34	0.34
Arg	195.36^b	254.45^a	191.55^b	20.75	0.02
His	133.21	165.01	126.13	17.40	0.09
Phe	127.03	119.41	150.87	16.24	0.16
Thr	181.08	199.64	152.40	28.53	0.28
Val	285.17	273.02	315.51	27.63	0.31
TEAA^d	1679.52	1739.62	1758.82	140.56	0.84
Ala	187.04^b	207.12^b	253.09^a	17.65	0.01
Gly	351.45	382.51	333.45	39.15	0.47
Glu	125.56	126.81	123.13	23.50	0.99
Ser	95.58	95.35	80.27	7.35	0.09
Pro	118.20	129.34	139.41	14.00	0.34
Tyr	76.21	94.93	68.44	11.38	0.09
Cys	41.75	52.64	47.25	5.45	0.17
Asp	1.15	1.37	1.04	0.35	0.65
TNAA^d	996.93	1090.09	1046.09	72.94	0.46
TFAA^d	2676.45	2829.71	2804.91	160.65	0.60

^a,bDifferent superscripts within a column represent significant differences (P < 0.05)
^cControl, saline; Arg group, saline + 9.42 g/L L-Arg; Ala group: saline + 19.31 g/L L-Ala
^dTEAA: Total essential amino acids; TNAA: Total non-essential amino acids; TFAA: total free amino acids

ISSN: 2049-1891