Item | Regression Eqs. 1 | Optimal supplemental Cu level. mg/kg2 | P-value | Coefficient of determination (R2) |
---|---|---|---|---|
Body weight | ||||
  Copper levels | y =  − 0.1003x2 + 1.3533x + 505.73 | 6.75 | 0.042 | 5.36 |
  CuPro | y =  − 0.1296x2 + 1.9294x + 505.78 | 7.44 | 0.066 | 6.73 |
Average daily gain | ||||
  Copper levels | y =  − 0.0101x2 + 0.1352x + 33.81 | 6.76 | 0.045 | 5.33 |
  CuPro | y =  − 0.0129x2 + 0.1926x + 33.82 | 7.47 | 0.067 | 6.63 |
Feed conversion ratio | ||||
  Copper levels | y = 0.00049x2 − 0.0091x + 1.3182 | 9.31 | 0.002 | 11.4 |
  CuPro | y = 0.00044x2 − 0.0088x + 1.3038 | 9.87 | 0.041 | 13.7 |
  CuSO4.5H2O | y = 0.00054x2 − 0.0095x + 1.3325 | 8.84 | 0.014 | 13.3 |