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Table 2 Growth performance of 17 d old broilers chicks fed different copper levels and sources

From: Broiler responses to copper levels and sources: growth, tissue mineral content, antioxidant status and mRNA expression of genes involved in lipid and protein metabolism

Item Copper levels (mg/kg) Source SEMa Source Level Source × Level Lb Qc
0 4 8 12 16 Inorganic Organic
BW, g/bird 505 512 510 505 503 505 509 1.319 0.164 0.169 0.921 0.282 0.044
ADG, g/bird/day 33.7 34.4 34.3 33.8 33.5 33.7 34.1 0.132 0.159 0.172 0.923 0.283 0.045
ADFI, g/bird/day 44.4a 44.2ab 43.8 ab 43.1b 43.5ab 44.1 43.5 0.158 0.053 0.041 0.813  < 0.01 0.531
FCR, g/g 1.31a 1.28ab 1.27b 1.27b 1.30ab 1.31 1.27  < 0.01  < 0.01 0.013 0.953 0.077  < 0.01
  1. Abbreviations: BW Body weight, ADG Average daily gain, ADFI Average daily feed intake, FCR Feed conversion ratio
  2. aStandard error of means
  3. bLinear effect of dietary copper levels
  4. cQuadratic effect of dietary copper levels
  5. Organic: copper proteinate (CuPro) and organic trace minerals; Inorganic: copper sulphate (CuSO4.5H2O) and inorganic trace minerals
  6. abMeans with a different superscript in a row are different (P < 0.05)