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Comparison of egg laying performance and reproductive performance of Xuefeng black-bone chicken with different amounts of added MCE (statistics every 4 wk): (A) laying rate; (B) average egg weight; (C) fertilization rate; (D) hatching rate. Note: In the same statistical period (4 wk), # represents significant difference (P < 0.05) compared with group E. E: MCE 0 mg/kg; F: MCE 100 mg/kg; G: MCE 150 mg/kg; H: MCE 200 mg/kg.
