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. 2019 Jul 27;3(4):1263–1269. doi: 10.1093/tas/txz112

Table 2.

Copper analysis of diets (as-fed basis)1,2

Added Cu3, mg/kg
Item Control CuSO44 CuSO4/Cu-AA5
17 70 130 70 100 130
Early finishing (d 0 to 43) 43 73 95 97 87 112
Late finishing (d 43 to 105) 31 86 123 89 117 139
Overall (d 0 to 105) 36 82 114 93 107 130

1Multiple samples of each diet were collected, blended, and subsampled before being analyzed at Minnesota Valley Testing Laboratory (New Ulm, MN).

2Values represent a feed intake-based weighted average of chemical Cu analysis for each treatment within early finishing (diet phases 1, 2, and 3 fed from 37 to 77 kg body weight), late finishing (diet phases 4 and 5 fed from 77 to 129 kg body weight), and overall. Permitted analytical variation for Cu analysis is 25% (AAFCO, 2018).

3The trace mineral premix was formulated to contribute 17 mg/kg of Cu from CuSO4 to the complete basal diet.

4CuSO4 = copper sulfate (Prince Agri Products, Quincy, IL). Values represent the sum of added Cu from the premix and supplemental Cu from CuSO4.

5CuSO4/Cu-AA = 50:50 blend of Cu from copper sulfate and copper–amino acid complex (Availa-Cu, Zinpro Corporation, Eden Prairie, MN). Values represent the sum of added Cu from the premix and supplemental Cu from CuSO4/Cu-AA blend.