Effects of different feeding systems on ruminal fermentation, digestibility, methane emissions, and microbiota of Hanwoo steers

• DOI: 10.5187/jast.2023.e82
• Publication Date: 2023-08-21T05:56:04Z
• Authors: Seul Lee; Jungeun Kim; Youlchang Baek; Pilnam Seong; Jaeyong Song; Minseok Kim; Seungha Kang
• Keywords: Hanwoo; Methane Emissions; Total mixed ration; Neutral Detergent Fiber; Digestion

This study evaluates how different feeding systems impact ruminal fermentation, methane production, and microbiota of Hanwoo steers native to Korea. In a replicated 2 × crossover design over 29 days per period, eight (507.1 ± 67.4 kg) were fed twice daily using separate (SF) system comprising concentrate mix forage or total mixed rations (TMR) in 15:85 ratio. The TMR-feeding group exhibited considerable neutral detergent fiber digestibility increase than the SF group. However, fermentation parameters production did not differ between two strategies. addition, TMR-fed expressed elevated Prevotellaceae family, Christensenellaceae R-7 group, an unidentified Veillonellaceae family genus abundance their rumen, whereas SF-fed rich Rikenellaceae RC9 gut Erysipelotrichaceae UCG-004, <italic>Succinivibrio</italic>. Through linear regression modeling, positive correlations observed Shannon Diversity Index group's dry matter intake production. Although do affect they can alter microbes. These results may guide future investigations manipulations as methane-mitigation practice examining feed ingredients.