임간초지의 개량 및 이용에 관한 연구 III. 임간초지에서 계절별 목초생산성 및 이용성

Studies on the improvement and Utilization of Pasture on the Forest III. Seasonal herbage production and utilization of pasture on the forest

林間混播草地 (비음도 30%)의 月別 목초생산성과 이용성을 구명하고자 면양을 공시하여 단구제(3 반복)로 配置하여 1987年부터 1988年까지 충남대학교 農科大學 試驗포장에서 試驗을 수행하였다. 초고, 엽면적지수, 건물생산량과 수절분포, 식생체화학성분,' 건물소화율, 초목이용율 및 저장효율등이 조사되었는데 그 결과는 다음과 같다. 1. 초고와 엽면적지수는 5월이 35cm와 4.89로 가장 높았고 다음이 4월 28.0cm, 4.23이었으며 10월이 13.0cm 및 0.49로가장 낮았다. 2. 건물수량은 5月이 2.040kg/ha로 가장 높았는데 年간건물수량(7.240kg/ha)의 28.2%를 차지하였다. 4월, 5월 및 6월의 봄철 건물수량은 年間건물수량의 58.3%였고 7월과 8월의 건물수량은 24.2% 9月과 10월은 17.5%였다. 그러나 6月, 7월, 8월 및 9월의 건물수량은 월별로 큰 차이가 없었다. 3. 일당 건물생산량은 5월이 65.8kg/ha으로 가장 높았고 다음이 6월 (28.7kg/ha)순 이었으며 10월은 16. 5kg/ha으로 가장 낮았다.(P<0.01) 4. 목초의 化學적성분 및 건물소화율은 4월, 5월, 6월의 봄철 목초가 7월 8월의 여름철 목초보다 조필자질합량과 건물소화율이 높은 반면에 粗織雄, ADF. 및 NDF함량은 낮았고 10월의 가을목초는 중간정도였다. 채식한 목초는 채식전 목초나 殘草보다 조회분함량과 건물소화율이 다소 높은 반면 粗鐵錯, ADF 및 NDF함량은 낮았다. 5. 代:謝體중당 건물섭취량과 4月이 68.9g 으로 가장 높았고 다음이 10月로 66.7g 이었으며 8月이 52.5g으로 가장 낮았는데 건물섭취량과 건물消化率 간에는 정의 相關(P<0.05)關係가 있었다. 6. 목초이용율은 4月이 83.4%로 가장 높았고 다음이 10月로 80.9% 이었으며 8月 은 64.0%로 가장 낮았는데 年평균 救草flJ用率은 75.5%이었다. 7. 반환 및 저장效率은 4月이 가장 높았고 다음이 10월이었으며 8월이 가장 낮았다.

This experiment was carried out to determine the seasonal herbage production and utilization during the growing season of pasture on the forest (shading 30%). Plant height, leaf area index(LAl), dry matter(DM) production and distribution, chemical composition, in vitro dry matter digestibility(IVDMD), herbage utilization percentage and chewing efficiency were investigated using the Corridale sheep. Experimental field was treated by one plot design(3 rep.) and performed from 1987 to 1988 at Chungnam National University, Daejon. The results obtained are summarized as follows: 1. The highest plant height and LA1 were observed in May(35.0 cm, 4.89), followed by April(28.0 cm, 4.23), while the plant height and LA1 in October (13.0 cm, 0.49) showed very low. 2. During the growing season, about 58.3 % of annual DM production (7240 kg/ha) was produced during the spring (April, May and June) and the highest DM production was obtained in May (2040 kg/ha), which was more than 28.2 % of total DM production. However, DM production in July and August was about 24.2 % and those in September and October (17.5 %) was very low, but the difference of DM production from June to September was small. 3. The maximum DM production per day (65.8 kg/ha) was observed in May, followed by June (28.7 kglha), while DM production per day in October (16.5 kg/ha) showed very low (p <0.01). 4. Crude protein content and IVDMD of herbage samples during the spring (April, May and June) were higher, while crude fiber, ADF, and NDF content were lower in an summer growth herbage samples (July and August), but autumn growth herbage samples was intermediate. Crude ash content and IVDMD of collected herbage samples were slightly more, while crude fiber, ADF and NDF content were slightly less than offered and residued herbage samples during the growing season. 5. The maximum DM intake per metabolic body size was observed in May(68.9 g), followed by October (66.7 g), while very low in August (52.5 g). Significant positive correlation (p <0.05) was found between DM intake and IVDMD. 6. Herbage utilization percentage was very high in April (83.4 %), while very low in August (64.0 %). The percentage of annual herbage utilization was about 75.5 %. 7. The maximum ruminating and chewing efficiency of herbage samples were observed in May, followed by October, while very low in August.