Table 3.

Summary statistics for rumination minutes during the 3 d following transportation for feedlot steers fed varying concentrations of Zn

	Treatment1				Contrasts
	CON	IND	SUPZN	SEM	Linear	Quadratic	No Zn vs. Zn
	n = 18 steers	n = 18 steers	n = 18 steers
Rumination2
Total, min/24 h
Day 13	309	286	259	23.1	0.14	0.84	0.21
Day 2	335	325	296	31.0	0.39	0.73	0.52
Day 3	317	302	281	30.8	0.42	0.88	0.50
Active
Total, min/24 h
Day 1	460	468	506	20.9	0.20	0.52	0.36
Day 2	474	515	497	16.8	0.55	0.46	0.39
Day 3	510	526	518	18.0	0.83	0.76	0.75
Nonactive
Total, min/24 h
Day 1	604	628	626	20.6	0.42	0.67	0.36
Day 2	614	585	636	25.6	0.64	0.19	0.90
Day 3	591	599	627	23.8	0.32	0.66	0.47

Dietary treatments – control (CON; no supplemental Zn); industry (IND; 70-mg supplemental Zn/kg DM); supranutritional Zn (SUPZN; 120-mg supplemental Zn/kg DM). All supplemental Zn provided through Plexomin Zn (Phytobiotics, Cary, NC).

Rumination, active, and nonactive minutes recorded via CowManager tags (Select Sires Inc., Plain City, OH).

Day 1: started immediately after unloading (0700 hours) and ended 24 h later; day 2: started 24 h after unloading (0700 hours) and ended 24 h later; day 3: started 48 h after unloading (0700 hours) and ended 24 h later.