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이형발효 유산균주가 이탈리안 라이그라스 및 총체보리 사일리지의 반추위 발효성상에 미치는 영향

Effects of Heterofermentative Lactic Acid Bacteria on the Ruminal Fermentation of Italian Ryegrass and Whole Crop Barley Silage

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본 연구는 이형발효 유산균을 첨가한 이탈리안 라이그라스 및 총체보리 사일리지의 저장 기간 동안의 변화에 따른 반추위 발효효과를 규명하고자 수행하였다. 사일리지의 접종 균주는 이형발효 유산균으로 Lactobacillus casei KACC 12413 및 Lactobacillus reuteri KCTC 3594 및 Lactobacillus casei + Lactobacillus reuteri로 하였다. In vitro 실험의 pH 변화는 LCR 처리구가 높은 경향이었으며, 작물 간의 차이는 WCB사일리지 보다 IRG 사일리지의 pH가 높았다. 총 가스 생산량은 대조구에 비해 유산균 첨가구가 낮았고, WCB 보다 IRG 사일리지가 높은 수준이었다. 암모니아태 질소 농도는 유산균 첨가구 보다 대조구가 높은 경향이었고, 30일 보다60일 사일리지가 낮았다. 총 휘발성지방산 생성량은 30일 및 60일 WCB 사일리지의 LC 처리구가 높았다. In situ 실험에서 건물소화율은 48시간 발효 했을 때 LCR 처리구가 높았고 대조구가 가장 낮았다. 작물 간에 차이는 WCB에 비해 IRG가 8∼10% 더높았다. NDF 소화율은 LC 처리구 및 LCR 처리구가 높은 경향이었고(p<0.05), ADF 소화율은 LC 처리구 및 LCR처리구가 높았다. 본 연구의 결과로 미루어 보아 propionate를 생성하는 이형 발효 유산균이 접종된 사일리지는 반추위 내 발효조건을 개선하고 가축의사일리지 소화율을 증진 시킬 것으로 보이며, 가축의 생산성 및 사료가치를 이 향상 될 것으로 여겨진다.

Abstract

The aim of this study was to investigate the effects of heterofermentative lactic acid bacteria(HLAB) on the quality of silage during fermentation period using Italian ryegrass(IRG) and Whole crop barley(WCB) silage. The Lactobacillus casei KACC 12416(LC) and Lactobacillus reuteri KCTC 3594(LR) was inoculated into the IRG and WCB silages. This study investigated the in vitro and in situ rumen fermentation effects. The control group were lower total gas production than all Lactobacilli group(p<0.05). The control group were higher ammonia nitrogen concentration than all Lactobacilli group, and the silage fermented for 60 days lower ammonia nitrogen concentration than that for 30 days. LC was high production of total VFA(p<0.05). In situ experiments, LCR was high dry matter digestibility when it was fermented for 48 hours, and the control group was the lowest. IRG were from 8 to 10% higher difference between crops than WCB. Based on the results of this study, it is shown that the silage with inoculation of the HLAB that produces propionic acid improves rumen fermentation conditions and increases the digestibility of silage for livestock. The Lactobacillus was very effective in protecting the IRG and WCB silage exposed to air under laboratory condition.

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