Table 4.

Effects of mineral supplement availability on liver mineral concentrations in suckled cows grazing native range¹; combined averages of years 1 and 2 of pasture treatment

			Treatment2
Item3	Sample		CON	SUPP	SE	P-value5
			-------µg/g-------
Se	Turn out		1.87	1.78	0.066	0.29
	Removal		2.23	2.89	0.153	0.004
		CHG4	0.35	1.11	0.166	0.003
Cu	Turn out		206.3	182.7	12.57	0.18
	Removal		185.2	305.4	21.88	0.0004
		CHG	-21.1	122.7	24.46	<0.0001
Zn	Turn out		140.8	141.6	8.42	0.95
	Removal		148.9	172.3	13.83	0.23
		CHG	8.12	30.74	15.167	0.29
Mo	Turn out		3.76	3.82	0.120	0.75
	Removal		4.29	4.20	0.094	0.50
		CHG	0.521	0.379	0.127	0.42
Mn	Turn out		11.12	11.40	0.373	0.58
	Removal		11.13	11.43	0.327	0.52
		CHG	0.013	0.021	0.3395	0.99
Co	Turn out		0.239	0.232	0.0105	0.61
	Removal		0.161	0.300	0.0284	0.002
		CHG	-0.078	0.067	0.0320	0.003

¹For this analysis, mineral concentration values were averaged between years 1 and 2.

²Treatments were: CON—Cows were grazing pastures with no access to a vitamin and mineral supplement or SUPP—Cows were grazing pastures with access to a vitamin and mineral supplement.

³Mineral concentrations are reported in µg/g on a dry matter basis. Liver samples were analyzed for concentrations of Se, Cu, Zn, Mo, Mn, and Co via inductively coupled plasma mass spectrometry at the Diagnostic Center for Population and Animal Health at Michigan State University (East Lansing, M.I.).

⁴CHG: Change in concentration, which reflects the concentration at pasture removal minus the value from pasture turn out.

⁵Significance considered at P ≤ 0.05.