국내 자생 해조류 첨가가 in vitro 반추위 발효 성상및 메탄 발생량에 미치는 영향
The Effects of Korean Seaweeds on In vitro Ruminal Fermentation Characteristics and Methane Production
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The present study was conducted to investigate the effects of seaweeds on in vitro ruminal fermentation characteristics and methane gas production. Five seaweeds (Dictyota dichotoma, DD; Chrysymenia wrightii Yamada, CW; Codium fragile, CF; Sargassum fusiforme, SF; Gracilaria vermiculophylla, GV) were obtained from National Institute of Fisheries Science (NIFS) in South Korea. The ruminal fluids were collected from 3 rumen-cannulated Hanwoo steers (average 12-months-old). The buffered ruminal fluids (50 mL) were incubated with substrates (0.4 g of concentrate and 0.1 g of rice straw in dry matter basis) and seaweeds (5% of substrates) at 39℃ for 24 and 48 hours. The total gas and methane production of all treatments incubated for 24 hours were not affected by the seaweed. However, methane production (mL/g of digested dry matter) in the CW and CF treatments incubated for 48 hours was decreased compared to control (p<0.05). Additionally, the ruminal pH of all treatments incubated for 24 and 48 hours was lower than control (p<0.05). There was no signigicant difference in total VFA concentration at 24 hours of incubation, but it was higher in the CF treatment at 48 hours of incubation (p<0.05). The dry matter digestibility of all treatments incubated for 24 and 48 hours were not affected by the seaweed. In conclusion, Codium fragile reduced in vitro methane production without negative effects on rumen fermentation characteristics.
Abstract
The present study was conducted to investigate the effects of seaweeds on in vitro ruminal fermentation characteristics and methane gas production. Five seaweeds (Dictyota dichotoma, DD; Chrysymenia wrightii Yamada, CW; Codium fragile, CF; Sargassum fusiforme, SF; Gracilaria vermiculophylla, GV) were obtained from National Institute of Fisheries Science (NIFS) in South Korea. The ruminal fluids were collected from 3 rumen-cannulated Hanwoo steers (average 12-months-old). The buffered ruminal fluids (50 mL) were incubated with substrates (0.4 g of concentrate and 0.1 g of rice straw in dry matter basis) and seaweeds (5% of substrates) at 39℃ for 24 and 48 hours. The total gas and methane production of all treatments incubated for 24 hours were not affected by the seaweed. However, methane production (mL/g of digested dry matter) in the CW and CF treatments incubated for 48 hours was decreased compared to control (p<0.05). Additionally, the ruminal pH of all treatments incubated for 24 and 48 hours was lower than control (p<0.05). There was no signigicant difference in total VFA concentration at 24 hours of incubation, but it was higher in the CF treatment at 48 hours of incubation (p<0.05). The dry matter digestibility of all treatments incubated for 24 and 48 hours were not affected by the seaweed. In conclusion, Codium fragile reduced in vitro methane production without negative effects on rumen fermentation characteristics.
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