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항원충성 식물 추출물이 반추위 발효특성, 미생물 성장 및 메탄 발생에 미치는 영향

Effects of Antiprotozoal Plant Extracts on Rumen Fermentation Characteristics, Microbial Growth and Methane Emission

김도형|이수경|이상민|이성실|문여황|이신자
동물생명과학연구소 (Institute of Animal Life Science)|2016.09|동물자원연구 (ANNALS OF ANIMAL RESOURCE SCIENCES)|제27권 제2호|pp. 111-123

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키워드

Methane emissionMicrobial growthRumen fermentationReal-Time PCRAntiprotozoal plants extracts
주제분류축산학

초록

This study was conducted to investigate the effects of antiprotozoal plant extracts on in vitro ruminal fermentation and methane emission. Ruminal contents were collected from two ruminally-fistulated steers (Average BW: 450±30 kg) consuming 60% Timothy hay and 40% concentrate with free access to water and mineral block. Plant extracts, Lonicera japonica, Torreya nucifera, Zanthoxylum schinifolium, Poncirus trifoliate and Citrus junos, which have been known to have antiprotozoal and antiparasitic effects were added (5% of substrate) to the in vitro ruminal fermentation bottles containing the mixture of rumen fluid and McDougall’s buffer. The McDougall buffer (1000 ml) and ruminal inoculums (500 ml) were combined and 20 ml added to the 50 ml fermentation vessels containing 300 mg of substrate (DM basis). The fermentation vessels were placed in an incubator at 39°C for 3, 6, 9, 12, 24, 48 and 72 h with shaking. Plant extracts addition was decreased (p<0.05) acetate:propionate compared with control except with T. nucifera addition. Total gas production was increased (p<0.05), whereas methane emission was decreased (p<0.05) by all plant extracts compared with control at 12 h incubation. Methane emission at 24 h incubation was decreased for Lonicera japonica, Torreya nucifera, and Zanthoxylum schinifolium compared with control as well. In addition, methanogenic archaea was decreased (p<0.05) by all plant extracts at the 12 h incubation. These results indicate that the plant extracts may decrease methane emission by inhibiting methanogenesis without the decrease of total gas production in 12 h in vitro ruminal fermentation. Therefore, plant extracts which have the antiprotozoal effect may be promising feed additives for ruminants as a methane inhibitor.

Abstract

This study was conducted to investigate the effects of antiprotozoal plant extracts on in vitro ruminal fermentation and methane emission. Ruminal contents were collected from two ruminally-fistulated steers (Average BW: 450±30 kg) consuming 60% Timothy hay and 40% concentrate with free access to water and mineral block. Plant extracts, Lonicera japonica, Torreya nucifera, Zanthoxylum schinifolium, Poncirus trifoliate and Citrus junos, which have been known to have antiprotozoal and antiparasitic effects were added (5% of substrate) to the in vitro ruminal fermentation bottles containing the mixture of rumen fluid and McDougall’s buffer. The McDougall buffer (1000 ml) and ruminal inoculums (500 ml) were combined and 20 ml added to the 50 ml fermentation vessels containing 300 mg of substrate (DM basis). The fermentation vessels were placed in an incubator at 39°C for 3, 6, 9, 12, 24, 48 and 72 h with shaking. Plant extracts addition was decreased (p<0.05) acetate:propionate compared with control except with T. nucifera addition. Total gas production was increased (p<0.05), whereas methane emission was decreased (p<0.05) by all plant extracts compared with control at 12 h incubation. Methane emission at 24 h incubation was decreased for Lonicera japonica, Torreya nucifera, and Zanthoxylum schinifolium compared with control as well. In addition, methanogenic archaea was decreased (p<0.05) by all plant extracts at the 12 h incubation. These results indicate that the plant extracts may decrease methane emission by inhibiting methanogenesis without the decrease of total gas production in 12 h in vitro ruminal fermentation. Therefore, plant extracts which have the antiprotozoal effect may be promising feed additives for ruminants as a methane inhibitor.

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