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

Table 7 Effects of arginine infusion on arteriovenous difference in free AA concentrations (μmol/L) of dairy cows

Items	Treatments^c			SEM	P-value
Items	Control	Arg group	Ala group	SEM	P-value
Lys	91.30	100.09	90.13	5.08	0.14
Met	12.99^b	19.12^a	14.13^b	1.26	< 0.01
Leu	84.29	85.27	84.58	4.54	0.98
Ile	43.83	41.33	44.57	2.66	0.46
Arg	61.62^b	76.51^a	63.70^b	4.29	0.01
His	95.68^b	122.67^a	103.33^b	7.08	0.01
Phe	28.58	27.71	24.97	3.74	0.61
Thr	79.82^b	90.86^a	79.58^b	3.27	0.01
Val	71.67	69.68	71.58	4.16	0.87
TEAA^d	569.79^b	633.25^a	576.57^b	14.36	< 0.01
Ala	136.98	145.09	145.77	10.37	0.65
Gly	229.23	238.24	237.59	19.39	0.88
Glu	60.64^b	72.16^a	54.95^b	4.03	< 0.01
Ser	62.78	66.73	66.51	2.21	0.17
Pro	66.76	64.08	64.58	5.16	0.86
Tyr	26.54	23.79	23.57	1.46	0.11
Cys	12.93	12.40	12.28	0.60	0.53
Asp	0.46	0.45	0.45	0.01	0.64
TNAA^d	596.33	622.92	605.69	25.53	0.58
TFAA^d	1166.11^b	1256.17^a	1182.25^ab	29.41	0.02

^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