TABLE 2

Zinc and copper levels in swine feed and fecal samplesa

Heavy metalType of sampleLevel (mg/kg)Dietary Zn and Cu requirement (mg/kg)
MedianMinimumMaximum95% CI of
ZincFeed139.8797,383.7563.14 ± 79.5750–100
Feces941.154112,3253,070.17 ± 393.47
CopperFeed31.53.21,384.3123.33 ± 13.643–6
Feces137.671.22,397806 ± 73.89
  • a Dietary requirements are based on the guidelines of the National Research Council, 2012 (8).