. 2022 Aug 2;100(9):skac246. doi: 10.1093/jas/skac246

Table 5.

Trace mineral concentrations of plasma and muscle by dietary treatment pretransit (day –1), posttransit (day 1), 6 d posttransit (day 6), and 27 d posttransit (day 27) in beef feedlot steers

	Treatment¹				Contrasts
	CON	IND	SUPZN	SEM	Linear	Quadratic	No Zn vs. Zn
Plamsa²
Copper, mg/L
Day –1^*^,⁴	0.92	0.89	0.86	0.02	0.25	0.88	0.32
Day 1	1.08	1.04	0.99	0.04	0.12	0.84	0.19
Day 6^*	1.00	0.95	0.97	0.02	0.66	0.53	0.51
Day 27^*^,⁴	0.85	0.84	0.80	0.02	0.39	0.72	0.52
Iron, mg/L
Day –1	2.06	2.05	2.08	0.10	0.89	0.85	0.96
Day 1	1.19	1.28	1.20	0.09	0.89	0.45	0.66
Day 6	2.03	2.00	2.30	0.13	0.18	0.27	0.45
Day 27	1.93	2.03	1.97	0.09	0.71	0.46	0.52
Zinc, mg/L
Day –1⁴	1.08	1.09	1.15	0.04	0.15	0.54	0.29
Day 1⁴	1.26	1.43	1.43	0.05	0.01	0.21	0.01
Day 6^*	1.12	1.22	1.34	0.02	0.01	0.76	0.01
Day 27	1.10	1.20	1.25	0.04	0.01	0.77	0.01
Muscle³
Zinc, mg/kg DM
Day 28	181	182	155	11.4	0.09	0.25	0.30

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). Zinc supplementation started on day –25, relative to trucking.

Steers per treatment: CON, n = 18; IND, n = 18; SUPZN, n = 18.

Steers per treatment: CON, n = 12; IND, n = 12; SUPZN, n = 11.

Outliers removed: Plasma: Copper (day –1) – 1 SUPZN;Copper (day 27) – 1 CON;Zinc (day –1) – 2 SUPZN; Zinc (day 1) – 1 CON, 1 SUPZN.

Back-transformed means are reported.