Table 2.

Analyzed copper contents in the experimental diets (mg/kg, as-fed basis)

Copper source1	Copper level, mg/kg
	0	5	10	20	40	80	160	200
TBCC	9.4 ± 2.1	14.9 ± 3.0	21.9 ± 3.3	28.1 ± 3.2	50.4 ± 4.7	90.6 ± 5.2	174.2 ± 10.4	213.4 ± 14.6
CuPro	9.4 ± 2.1	15.4 ± 2.2	22.3 ± 3.8	30.8 ± 3.5	51.3 ± 5.2	88.7 ± 9.8	170.8 ± 13.4	–

Value expressed as mean ± standard deviation (SD) based on triplicate determinations

¹TBCC tribasic copper chloride, CuPro copper proteinate