한우용 주요 원료사료별 반추위 내 발효특성과 온실가스 발생량에 관한 연구

Abstract

This study aimed to estimate the rumen fermentation characteristics and greenhouse gas emissions of major domestic feed sources for Hanwoo. Five feed sources mainly used in South Korea were selected: corn meal (CM), soybean meal (SM), wheat flour (WF), palm kernel cake (PKC), and corn distiller’s dried grains with soluble (DDGS). These feed sources were purchased from a commercial feed company. For 24 h rumen incubation, each feed source (0.3 g) was placed into the incubation bottle with the rumen mixture (30 mL) in quadruplicates. After incubation, total gas production was measured and sub-sampled for CO2 and CH4 analyses, and the bottle content was centrifuged for rumen fermentation characteristics and in vitro dry matter digestibility (IVDMD). Crude protein content was highest in SM and lowest in CM. Ether extract content was highest in DDGS and lowest in SM, while neutral detergent fiber and acid detergent fiber contents were highest in PKC and lowest in CM. Propionate content was highest in DDGS, and butyrate and A:P ratio contents were highest in PKC (p<0.05). Total gas emission (mL/g DMD) was lowest in SM and DDGS, while CH4 emission (mL/g DMD) was lowest in DDGS (p<0.05). Therefore, this study concluded that DDGS could be an alternative feed source to reduce methane emissions.