| Summary: | The use of the fermented total mixed ration (FTMR) is a promising approach for the preservation of feedstuff, but the effect of FTMR on the between growth performance and ruminal microflora of lambs are still limited. This study aimed to assess the effects of different roughage types in the FTMR on growth performance and rumen microbiota of lambs. Forty-five six-month-old Small tail Han sheep × Ujumqin male lambs were randomly allocated into three groups (three pens per treatment and five lambs per pen) with the initial body weight (BW) of 28.50 ± 1.50 kg. The three treatments were as follows: the low oat percentages group (LO) contained 200 g/kg oat hay + 400 g/kg alfalfa hay, the medium oat percentages group (MO) contained 300 g/kg oat hay + 300 g/kg alfalfa hay, and the high oat percentages group (HO) contained 400 g/kg oat hay + 200 g/kg alfalfa hay. The result revealed that the dry matter intake and average daily gain were markedly (<i>p</i> < 0.05) higher in the MO treatment than in the LO and HO treatments, whereas no significant difference (<i>p</i> > 0.05) was found in the final body weight. There were no significant (<i>p</i> > 0.05) differences on the Shannon and Simpson index among the three treatments. The PCoA score plot illustrated the individual separation in the LO, MO, and HO treatments. At the phylum level, the presence of <i>Bacteroidetes</i> and <i>Firmicutes</i> belonging to the dominant phyla is widely described in rumen communities among the three treatments. The relative abundances of <i>Prevotella</i>, <i>Fibrobacter</i>, and <i>Succinivibrio</i> in the level of the genes were remarkably higher (<i>p</i> < 0.05) in MO treatment than that in LO and HO treatments, while the relative abundance of <i>Sediminispirochaeta</i> was remarkably higher (<i>p</i> < 0.05) in LO treatment than that in MO and HO treatments. These results indicated that the MO treatments could more effectively improve growth performance than the LO and HO treatments, and also revealed that the different forage types in diets reshaped the compositions and function of the rumen microbiota. Consequently, the findings presented in this study provide a reference for the application of FTMR in animal production and the understanding of the interaction between diet, animal performance, and ruminal microbiota.
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