Assessment of Reference Values for Copper and Zinc in Blood Serum of First and Second Lactating Dairy Cows

Table 1

Different reference values for copper and zinc in blood serum in the literature.

Cu ($\mu$mol/L)	Zn ($\mu$mol/L)	Reference
16–32	—	[13]
12–20	>7.7	[14]
>12.6	>12.6	[15]
5.2–5.5	—	[16]
16–32	10.7–19.9	[17]
12.5–32.8	12–46	[18]
12–24	12–24	[19]
8–39	10–20	[20]
14–19	14.5–20.0	[21]