Table 2.

Effects of jugular-infused arginine on the serum concentrations of growth hormone, insulin, and prolactin in lactating dairy cows challenged intravenously with LPS

	Experimental treatments1				SEM	P-value2
Item	Con	Arg	LPS	LPS + Arg
Growth hormone, μg/L
0-h preinfusion	18.60	19.05	19.37	17.37	2.68	0.964
3-h postinfusion	17.26	16.78	19.39	21.6	2.29	0.374
6-h postinfusion	17.01	16.42	18.92	19.69	2.19	0.657
Insulin, mIU/L
0-h preinfusion	26.88	23.52	23.70	26.43	3.70	0.780
3-h postinfusion	23.30b	34.80a	26.33ab	30.25ab	3.51	0.071
6-h postinfusion	26.24	32.14	26.35	30.34	3.27	0.390
Prolactin, ng/L
0-h preinfusion	286.18b	473.20a	334.53b	373.50ab	44.44	0.014
3-h postinfusion	303.32	420.02	306.22	408.48	50.17	0.695
6-h postinfusion	285.74	306.22	415.06	401.63	56.73	0.239

^a,bValues within a row with different letters differ (P < 0.05).

¹Treatments: Saline (Con); LPS (lipopolysaccharide, 0.2 μg/kg BW per day); Arg (Arginine, 18 g/d); LPS + Arginine (0.2 μg/kg BW per day of LPS and 18 g/d of Arg).

²Probability of a difference among the 4 treatments.