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Number of copies of the mrcA gene for two contrasting levels of RFI of the animals: low RFI (LRFI, −0.78 ± 0.22 kg DMI/d) and high RFI (HRFI, 0.83 ± 0.34 kg DMI/d) steers. The line inside each box represents treatment median and the ends of the whiskers represent the minimum and maximum values of all of the data for each treatment.
