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Relative abundances of the four major bacterial phyla and genus profiles identified by 454 pyrosequencing. Data are shown as the percentages of the total identified sequences per group. HW-1, HW0, HW1, and HW3 represent calves at −1, 0, 1, and 3 weeks, respectively, after weaning in the HAY group (n = 8), and CW-1, CW0, CW1, and CW3 represent calves at −1, 0, 1, and 3 weeks, respectively, after weaning in the CON group (n = 8).
