Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Concentrate supplementation: A way to mitigate enteric methane emissions in pregnant Hanwoo heifers

  • Md Raihanul Hoque (Division of Animal and Dairy Sciences, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Hyunjin Cho (Division of Animal and Dairy Sciences, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Mingyung Lee (Division of Animal and Dairy Sciences, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Jakeyom Seo (Department of Animal Science, Life and Industry Convergence Research Institute, Pusan National University) ;
  • Sangsuk Lee (Department of Animal Science and Technology, Sunchon National University) ;
  • Seongwon Seo (Division of Animal and Dairy Sciences, College of Agriculture and Life Sciences, Chungnam National University)
  • Received : 2024.02.14
  • Accepted : 2024.07.16
  • Published : 2024.09.01
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Abstract

The objective of this study was to investigate the effect of supplementing concentrates in a forage-based diet on methane emissions of pregnant Hanwoo heifers. Twenty-one pregnant Hanwoo heifers (481 ± 42.4 kg) were divided into two groups: 1) a group receiving forage only (control, CON) and 2) the other group receiving forage with 4 kg of a concentrate mix (treatment, TRT). Methane (CH4) concentration was measured using a laser methane detector, following an 18-d adaptation period, according to previously established protocols. Feed intake was recorded throughout the experimental period. Ruminal fluid was collected and analyzed for pH, ammonia-nitrogen (NH3-N), and volatile fatty acid (VFA). The TRT exhibited higher dry matter and neutral detergent fiber intake than CON (p < 0.05) with elevated NH3-N (p < 0.001) and total VFA concentrations (p = 0.013). The proportions of butyrate, valerate, and iso-valerate were higher in TRT than CON (p < 0.05). Notably, CH4 concentrations per kg dry matter intake was lower in the TRT group, both from respiration and eructation (p < 0.05). In conclusion, supplementing concentrates in a low-quality forage-based diet for pregnant Hanwoo heifers fulfills nutrient requirements and reduces CH4 emissions, suggesting a potential strategy to reduce environmental impact of Hanwoo production.

Keywords

Acknowledgement

This work was supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture and Forestry (IPET) through Livestock Industrialization Technology Development Program, funded by Ministry of Agriculture, Food and Rural Affairs (321083-5).

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