Table 4.

Serum and tissue Cu and Zn content of pigs fed diets with two Cu and Zn sources (SF and HCl) at two Cu levels (15 and 160 mg/kg)¹

		Serum, mg/L2		Liver, mg/kg DM		Bone, mg/kg4
Cu and Zn Source	Cu level, mg/kg	Cu	Zn	Cu3	Zn	Zn
SF		1.69	0.71	1.68	213.6	257.2
				(48.7)
HCl		1.79	0.72	1.80	221.6	268.0
				(71.0)
SEM		0.031	0.017	0.042	9.58	3.56
	15	1.65	0.67	1.59	199.9	258.5
				(39.5)
	160	1.83	0.76	1.89	235.4	266.7
				(80.2)
SEM		0.031	0.017	0.041	9.53	3.72
P-value
Source		0.037	0.438	0.036	0.553	0.041
Level		<0.0001	0.0002	<0.0001	0.011	0.115
Source × Level		0.130	0.593	0.584	0.991	0.044

¹Data are means of 12 replicate pens for the two-way interaction, whereas for the main effects of source and level are means of 24 replicate pens (one pig per replicate pen was sampled).

² P-value of day of sampling at days 14 and 42 (P < 0.0001). P-value of interaction between source × level × day for Cu (P = 0.299) and for Zn (P = 0.010).

³Log₁₀-transformed liver Cu concentration. Values in parentheses show the non-transformed values.

⁴Cu detected values are lower than 0.02 mg/g by ICP-OES.