The Chemical Composition and Ruminal Dry Matter Digestibility of Leaves+Stems, Leaves, Stems and Roots of Aralia cordata Thunberg as a Roughage Sources

조사료원으로서 땅두릅(Aralia cordata Thunberg) 잎+줄기, 잎, 줄기 및 뿌리의 화학적 조성 및 반추위내 건물소화율

The chemical composition and ruminal dry matter digestibilities of leaves, stems and roots of Aralia cordata Thunberg were determined and compared each other as a roughage sources for ruminants. The crude protein contents were higher for leaves(12.4%) than for leaves+stems (9.7%), stem(5.1%) and roots (3.8%) (P<0.05). The crude fat contents were higher for leaves (3.7%) than for roots (2.1%) and stems (1.3%) (P<0.05). The crude fiber contents were lower for roots (12.3%) than for leaves (15.0%), leaves+stems (27.7%) and stems (40.3%) (P<0.05), respectively. The contents of neutral detergent fiber were lower for leaves (30.2%) than for leaves+stems (42.0%), roots (50.8%) and stems (60.0%) (P<0.05), respectively. The contents of acid detergent fiber were lower for root(18.3%) than for leaves(21.4%). leaves+stems (37.5%) and stems (49.6%) (P<0.05), respectively. The calcium content of leaves(2.4%) were higher than those of stems and roots (0.97% and 0.69%), however the phosphorus contents were similar among leaves, stems and roots(0.25%, 0.19% and 0.35%). Ruminal dry matter digestibilities for 12, 24, 48 and 72hr of leaves(38.9%, 65.9%, 79.8% and 82.4%) and roots(38.9%, 59.8%, 77.6% and 78.5%) were higher than stems(31.1%, 44.1%, 49.5% and 52.6%). Furthermore the digestibilities of leaves were higher than those of alfalfa hay(37.4%, 48.8%, 67.8% and 71.8%) and although the digestibilities of stems which were the lowest among the parts were higher than those of acasia wood chip(12.6%, 18.2%, 21.6% and 24.3%).

반추동물사육을 위한 농산부산물의 조사료로써 새로운 개발 및 재활용을 위하여 이른 봄 새싹은 식물(나물)으로 이용하나 그 후 성장한 부위는 특별한 용도 없이 폐기되는 땅두릅의 잎과 줄기, 잎, 줄기 및 뿌리의 화학조성분을 분석하고 이들의 반추위 내 건물 소화율을 측정하여 부위별 수치를 비교하였다. 1. 땅두릅의 단백질 함량은 잎과 줄기(9.7%), 잎(12.4%), 줄기(5.1%) 그리고 뿌리(3.8%)로 나타났고(P<0.05), 각각의 조지방 함량도 3.05, 3.7%, 1.3% 및 2.1%로 나타났다(P<0.05). 2. 조섬유의 함량은 잎(15.0%) 및 뿌리(12.3%)가 줄기(40.3%)보다 낮게 나타났다(P<0.05). 3. 중성세제 섬유소 함량은 잎(30.2%)이 줄기 및 뿌리(60.0% 및 50.8%)보다 낮게 나타났으며(P<0.05), 산성세제 섬유소 함량은 잎(21.4%) 및 뿌리(18.3%)가 줄기(49.6%)보다 낮게 나타났다(P<0.05). 4. 칼슘함량은 잎(2.4%)이 줄기나 뿌리(0.97% 및 0.69%)보다 높았다. 그러나 인의 함량은 모두 유사한(0.25%, 0.19 및 0.35%) 경향이었다. 5. 시간별로 12, 24, 48 및 72시간 동안의 반추위 건물 소화율은 잎(38.9%, 65.9%, 79.8% 및 82.4%)과 뿌리(38.9%, 59.8%, 77.6% 및 78.5%)가 줄기(31.1%, 44.1%, 49.5 및 52.6%)보다 높았으며 잎의 소화율은 알팔파건초의 소화율(37.4%, 48.8%, 67.8% 및 71.8%)보다도 높았다. 그리고 소화율이 비교적 낮은 줄기의 소화율도 아카씨나무 파쇄물(12.6%, 18.2%, 21.6% 및 24.3%)보다도 월등이 높았다.