Table 4.

Blood serum metabolites of beef feedlot steers fed different concentrations of Zn and transported 18 h

	Treatment1				Contrasts
	CON	IND	SUPZN	SEM	Linear	Quadratic	No Zn vs. Zn
	n = 18 steers	n = 18 steers	n = 18 steers
Lactate, mmol/L
Day –1*	5.5	4.7	4.9	0.25	0.35	0.45	0.25
Day 1*,5	6.6	4.7	5.9	0.26	0.27	0.01	0.04
Day 6*,5	4.9	4.0	4.5	0.20	0.43	0.18	0.20
Glucose, mg/dL
Day –1*	103	98	100	1.5	0.38	0.39	0.25
Day 1*	99	97	104	1.8	0.41	0.30	0.75
Day 6*	103	94	101	1.3	0.51	0.03	0.14
FRAP2, µM
Day –1	308	303	317	14.6	0.71	0.60	0.90
Day 15	278	281	282	13.8	0.83	0.96	0.83
Day 65	293	279	284	12.2	0.58	0.53	0.44
SUN3, mg/dL
Day –1	10.3	10.3	11.8	0.41	0.02	0.07	0.13
Day 1	8.9	8.6	9.8	0.36	0.12	0.06	0.52
Day 6	9.5	10.5	11.3	0.42	0.01	0.86	0.01
NEFA4, mEq/L
Day –1*	196	174	178	6.4	0.33	0.50	0.25
Day 1*	399	478	450	16.4	0.24	0.26	0.13
Day 6*	193	196	203	7.4	0.66	0.87	0.74

Treatment were no supplemental Zn (CON), 70-mg supplemental Zn/kg DM (IND), and 120-mg supplemental Zn/kg DM (SUPZN). All supplemental Zn provided via Plexomin Zn (Phytobiotics, Cary, NC).

Ferric reducing antioxidant power.

Serum urea nitrogen.

Nonesterified fatty acid.

Outliers removed: Lactate (day 1) – 1 CON, 1 SUPZN; Lactate (day 6) – 1 IND; FRAP (day 1) – 1 CON, 1 SUPZN; FRAP (day 6) – 1 CON, 1 SUPZN.

Back-transformed means are reported.