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RISS 인기검색어
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- 저자 : 임동찬(D . C . Rim) (검색결과 1 건)
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김충수(C . S . Kim),이인덕(I . D . Lee),박종수(J . S . Park),임동찬(D . C . Rim) 한국축산학회 1989 한국축산학회지 Vol.31 No.11
A study was conducted to determine the herbage productivity and availability upon the flat, slope and forest type of grassland using Korean native cattle and sheep under 4 year old grassland established by intensive and semi-intensive sowing methods in Daecheon, from 1987 to 1988. The results obtained are summarized as follows ; 1. Orchardgrass made up the major plant species of the diets on all grassland types, especially the proportion of orchardgrass was 81-92% of the diets on the forest grassland. The proportions of tall fescue and ladino clover of the diets slightly increased on the flat and slope grassland in summer(July and August). Plant height and leaf area indes (LAI) on the flat, slope and forest grassland were 23.9cm-3.46, 23.1 cm-3.27 and 21.3cm-2.91 in average, respectively. Total dry matter(DM) yield per ha on the flat, slope and forest grassland was 10,286kg, 9,563kg and 6,341kg, respectively. The seasonal distribution of DM yield on all grassland types was 64∼70% in spring (April, May and June). Crop growth rate (CGR) on the flat, slope and forest grassland were 44.4kg, 41.4kg and 27.3kg, respectively. 2. Contents of crude protein (CP) and in vitro DM digestibility(IVDMD) of collected herbage samples were high in spring, while contents of crude fiber(CF) and neutral detergent fiber(NDF) were high in summer on all grassland types. The order of the contents of CP and IVDMD was flat$gt;slope$gt;forest grassland. The DM and organic matter(OM) intake per unit metabolic body size(g/w^75kg) were high on the flat, grassland, but those on the forest grassland, were low, digestible DM intake(DDMI) and DOMI showed a same tendency. Significantly positive correlations was found between DMI and CP(p$lt;0.05), and IVDMD(p$lt;0.01), but significantly negative correlation(p$lt;0.05) was found between DMI and NDF on all grassland types. The order of the DMI was spring$gt;summer$gt;autumn. 3. The percentage of herbage utilization on the flat, slope and forest grassland was 76.2%, 75.2% and 74.8%, respectively. The order of diet preference based on the relative intake index(RII) and touch number was flat$gt;slope$gt;forest grassland. Grazing capacity on the flat, slope and forest grassland was 542,496 and 323 cow-day/ha in average, respectively. The calculated value of grazing area per cattle(AU) on the flat, slope and forest grassland was 0.67ha, 0.74ha and 1.13ha, respectively. 4. Grazing and ruminating time were not different among the grassland types, but those were slightly increased on the forest grassland. Resting and loafing time were slightly increased on the flat grassland. Walking time was increased on the slope grassland. The number of rumination, chews per bolus and urination were slightly increased on the forest grassland, but defecation number was increased on the flat grassland. The number of drinks, total drinking water consumption and walking distance were slightly increased on the slope grassland. 5. Animal distance and occupied area per cattle on the flat, slope and forest grassland were 4.34m-11.7㎡, 3.97m-12.6㎡ and 3.76m-16.8㎡, respectively. Subgroup formation on those grassland was 3.9head, 4.4 head and 4.2 head per group respectively. The order of grazing movement was similar to the pear-shaped grazing formation, but the relation of dominance between first grazer and last grazer upon different grassland types was not clear. 6. Eating, ruminating and chewing time on the flat grassland were slightly less than on the other grassland. The order of eating rate, ruminating and chewing efficiency was flat) slope) forest grassland. 7. Live weight gain per day on the flat, slope and forest grassland during the grazing and feeding was 0.586-0.923kg, 0.565-0.882kg and 0.470-0.826kg, respectively. The order of feed efficiency was flat$gt; slope$gt;forest$gt;grassland. 8. The cost value of grasses per ha which was not included the rent was 650.1 thousand won on the flat, 650.1 thousand won on the slope and 5
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