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. 2019 May 28;10:1131. doi: 10.3389/fmicb.2019.01131

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Copyright © 2019 Lourenco, Callaway, Kieran, Glenn, McCann and Stewart.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Bacterial abundance at the genus level for calves in different diets (CON = conventional cow-calf system without supplementation of calves. PCON = calves were creep fed. ENZ = calves were creep fed with an enhanced feed containing xylanase): genera with relative abundances ≥ 2% (group averages shown). (A) Samples collected on calves’ weaning day. (B) Samples collected 4 weeks after weaning. ^*Bonferroni-corrected pairwise comparisons revealed differences across groups only for Prevotella on weaning day: Mean relative abundances (and standard deviations) were 15.4(1.4)^b, 18.1(3.9)^ab and 20.1(3.4)^a % for CON, PCON and ENZ, respectively. Four weeks post-weaning, only a trend (P = 0.06) for differences in Prevotella were observed: Mean relative abundances were 18.3(2.7)^a, 22.1(3.7)^a and 21.6(3.2)^a % for CON, PCON and ENZ, respectively. Means not sharing the same superscript ^a,b were different (P = 0.02).