• 한국초지조사료학회지
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• 제18권1호
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• pp.19-26
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• 1998

The effects of different fertilizer management on herbage production and botanical composition were determined. Field experiments were conducted during 1991 - 1993 on sandy loam soil at Allgiu south western Germany under variabling fertilizer management; cattle slurry, NPK, PK chemical fertilizer management and zero fertilization. The dry matter yield of forage was the highest in the plot of mineral fertilizer and lowest in the plot of without fertilization. The dry matter yield of P-K application was higher by 1.2 ton than that of without fertilization. The content of crude protein, crude fibre, digestible dry matter yield, net energy and nitrogen content of plants was not significantly different among different fertilizer management. N uptake of plants was in the order NPK chemical fertilizer (347kg N/ha) > cattle slurry (337kg N/ha) > P-K chemical fertilizer (325kg N/ha) > without fertilization (3 15kg N/ha).

• 한국초지조사료학회지
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• 제18권2호
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• pp.129-132
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• 1998

Birdsfoot trefoil grows wild in some parts of Korea, but specific information is lacking as to its growth characteristics, nutritive value and dry matter production potential. The objective of this study was to evaluate the usefulness of wild birdsfoot trefoil(Lotus cornicubus L.) as a forage. Wild birdsfoot trefoil and Au Dewey were field sown at Keongsan, Keongbuk in the spring of 19%. Emergence for Au Dewey was better than for wild birdsfoot trefoil. It was observed that the flowering date of the wild birdsfoot trefoil was similar to Au Dewey. Regrowth of Au Dewey was better than that of the wild birdsfoot trefoil at each harvesting. AAer the last harvesting date, October 1, there was no regrowth of the wild birdsfoot trefoil, but regrowth of Au Dewey measured IOcm. Weed infestation in the wild birdsfoot trefoil plots was higher than in the Au Dewey plots. The dry matter yields were significantly(P< 0.05) higher for Au Dewey than for the wild birdsfoot trefoil.

• 한국초지조사료학회지
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• 제10권2호
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• pp.77-83
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• 1990

A three year's field experiment was carried out on newly reclaimed tidal saline soils to evaluate the salt tolerance and growht characteristics, and their relationship to dry matter production and nutrient quality of main selected pasture species. Nine temperate grasses (14 varieties) and two forage crops (sorghum and pearl millet) were grown under different mulching treatments with medium sand and red-yellow soils (fine loamy materials of Typic Hapludults) from 1986 to 1988. Tall wheatgrass, tall fescue, reed canarygrass and alfalfa showed a good tolerance to soil salinity, especially tall wheatgrass (cv. Alkar) produced 19.6 ton/ha dry matter yield annualy under mulching treatment with medium sand depth in lcm. Pearl millet (cv. Gahi-3) was also evaluated as a salt tolerable forage species. Under salt stress in newly reclaimed tidal lands, plant showed a decrease in the assimirable leaf area (LA) as well as specific leaf area (SP. LA) and a low leaf weight ratio(LWR), and it resulted in a low concentration of crude protein and low digestible dry matter contents. Absorption of macro and micro elements in the plant on tidal lands was increased markedly.

• 한국초지조사료학회지
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• 제4권2호
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• pp.140-146
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• 1983

Sudangrass와 Sudangrass${\times}$Sorghun의 交雜種인 Pioneer 931과 Pioneer 988의 乾物生産量, 一般組成分 生産量, hemicellulose와 世胞內容物 生産量 그리고 乾物, 纖維素의 消化率 및 可消化에너지와 可消化蛋白質을 調査하였다. 1. 10a當 乾物生産量은 Sudangrass가 1,638kg으로 가장 많았고, Pioneer 988은 1,404kg, Pioneer 931은 1,282kg으로 적었다. Sudangrass와 Pioneer 988은 刈取次에 따른 影響이 比較的 僅小하였으나 Pioneer 931은 3次 刈取次에 産量의 11%로서 매우 적었다. 2. 纖維素는 消化率과 kg當 可塑化에너지값은 Pioneer 931, Pioneer 988 및 Sudangrass 順으로 낮아지는 傾向을 나타냈다. 그러나 10a當 可塑化에너지 生産量은 Sudangrass, Pioneer 988 및 Pioneer 931 順으로 各各 4,623, 4,170 및 3,970 Mcal였다. 3. 乾物의 in vitro 消化率은 草種間에 뚜렷한 傾向이 없었으나 可消化乾物 生産量은 Sudangrass, Pioneer 988 및 Pioneer 931에서 10a當 各各 1,068, 939 및 893kg의 順이었다.의 順이었다.

• 한국초지조사료학회지
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• 제9권2호
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• pp.96-102
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• 1989

This field experiment was conducted to determine the effect of grazing and cutting management on the forage production and botanical composition at different legumes sown swards of the experimental field of Livestock Experiment Station. in Suweon, from Aug. 1985 to Oct. 1988. The results obtained are as follows: 1. Dry matter yield of cutting management (1213.0 kg/lOa) was higher by 19% than that of grazing management (1016.8 kg/lOa). Yield of pasture mixtures including alfalfa both cutting and grazing were higher than those including ladino clover and red clover. Yield under grazing was inferior to cutting in the first year but superior in the second year. 2. Seasonal dry matter production under grazing showed 5 1% in spring, 33% in summer and 16% in autumn, but under cutting showed 46% in spring, 42% in summer and 12% in autumn. 3. Daily dry matter production per 10a under grazing is decreased 5.9 kg in spring, 5.5 kg in summer and 3.7 kg in autumn. But under cutting is decreased 8.7 kg in summer, 6.6 kg in spring and 3.4 kg in autumn. 4. Botanical compositions of mixtures swards involving ladino clover and red clover were not influenced by method of defoliation. But mixtures swards including alfalfa were highly influenced by method of defoliation. Alfalfa ratio at the time of final utilization under grazing was about 30%, but under cutting was about 70-80%.

• 한국초지조사료학회지
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• 제17권1호
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• pp.35-42
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• 1997

Many farmers apply cattle slurry on grassland, often in excess of crop N requirements, resulting in groundwater contamination. Our research objective was the development of grassland management systems that reduce undesirable sideeffects on other compartment of the ecosystem. Field experiment was conducted during 1991~1993 on sandy loam soil at AllgZiu south western Germany. Different sets of conditions were tested such as : zero fertilization, reduced sluny application$(l20kg N ha^{-1}yr^{-1})$, intensive sluny application(conventional sluny application, $240kg N ha^{-1}yr^{-1}$). The plots of the reduced slurry application had no significant effect on dry matter yields, digestible dry matter and net energy of herbage. Dry matter yield of zero fertilization was significantly lower than that of usual slurry application, however the content of Ca and Mg in herbage tended to increase. We conclude that reduced sluny application can be applied on grassland without adverse effects on dry matter production and quality of herbage.

• Asian-Australasian Journal of Animal Sciences
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• 제19권9호
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• pp.1283-1290
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• 2006

The effect of substituting potato by-products based silage (PBS) for concentrates on ruminal fermentation, methane production and nitrogen utilization in Holstein steers was evaluated. Three growing Holstein steers ($490{\pm}19kg$, initial body weight) were used in a $3{\times}3$ Latin square experiment with three experimental diets in which PBS was included at (1) 0, (2) 19 and (3) 27%, on a dry matter basis, replacing concentrates and wheat bran. Increasing replacement levels of PBS slightly increased dry matter (DM), organic matter (OM), NDF and ADF intakes by the steers (p<0.05). Inclusion of PBS at 19% increased crude protein (CP) digestibility of the experimental diets compared with the control (p<0.05). Substitution with PBS increased ADF digestibility and nitrogen retention (p<0.05), but did not affect energy retention. Energy loss as methane ranged between 5.0 and 6.1% of the total gross energy intake. There were no significant differences in carbon dioxide and methane production among all PBS levels, while daily methane production numerically increased with PBS inclusion. Substituting PBS for concentrates did not significantly affect ruminal pH and ammonia N concentration. Total VFA concentration, VFA molar proportions and blood metabolites were also unaffected by PBS replacement. These results suggest that substitution of PBS up to 27% of diet dry matter did not significantly increase methane production and was equal or superior to concentrates in ADF digestibility and nitrogen retention for growing steers.

• Asian-Australasian Journal of Animal Sciences
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• 제19권8호
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• pp.1120-1126
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• 2006

Dry matter (DM) degradation of leaves from Quercus cercis, Quercus libari, Quercus branti, and Quercus coccifera was determined using two different techniques: (i) in vitro gas production and (ii) the nylon bag degradability technique. In vitro gas production in the presence or absence of PEG and in situ DM disappearance were measured at 3, 6, 12, 24, 48, 72 and 96 h. In situ and in vitro DM degradation kinetics were described using the equation y = a+b ($1-e^{-ct}$). At all incubation times leaves from Quercus branti incubated with or without PEG gave significantly higher gas production than the other oak leaves except for 3 and 6 h incubation when leaves from Quercus branti without PEG supplementation only gave higher gas production than Quercus cercis and Quercus coccifera. At all incubation times except at 3, 6 and 12 h the DM disappearance from Quercus branti was significantly higher than the other species. Generally, PEG supplementation considerably increased the gas production at all incubation times and estimated parameters such as gas production rate ($c_{gas}$), gas production (ml) from the quickly soluble fraction ($a_{gas}$), gas production (b) from the insoluble fraction, potential gas production (a+b). However, all oak leaves did not give the same response to the PEG supplementation. Although the increase in gas production at 96 h incubation time was 8.9 ml for Quercus libari the increase was 5.5 ml for Quercus coccifera. It was concluded that except at early incubation times the relationships between the two methodologies seem to be sufficiently strong to predict degradability parameters from gas production parameters obtained in the presence or absence of PEG.

• Asian-Australasian Journal of Animal Sciences
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• 제18권2호
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• pp.214-220
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• 2005

The study was conducted to compare the dry matter intake and digestibility of Atriplex halimus (AH) and Atriplex nummularia (AN) and determine the proper proportion of saltbushes for partial replacement of alfalfa hay in the diets of Awassi sheep. The foliage of AH and AN were hand-plucked, air-dried in shade and then chopped mechanically similar to alfalfa hay. Two trials were conducted separately to determine voluntary feed intake and digestibility of saltbush browse. In the first trial, fifteen 8 month old Awassi lambs were distributed into 3 equal groups, and each animal was housed in individual pen. Each group received one of three dietary treatments: chopped alfalfa hay (H), dried foliage of Atriplex nummularia or foliage of Atriplex halimus. In the second trial, twentyseven 12 months old Awassi male lambs were randomly selected, distributed into nine equal groups, and housed into metabolic crates. Each group of animals received one of nine dietary treatments: alfalfa hay, AN, AH and different proportions (25, 50 and 75%) of AN or AH mixed with alfalfa hay. Forage type had a significant (p<0.001) effect on dry matter intake (DMI) and growth rate of lambs of the voluntary feed intake trial. Lambs receiving the alfalfa hay diet showed high DMI and high growth rate compared to those fed the diets containing saltbush. In the digestibility trial, dietary treatments had significant (p<0.05) effect on DMI, dry matter digestibility (DMD) (p<0.01) and organic matter digestibility (OMD) (p<0.01). The inclusion of AN in the diet up to 50% had no significant effect on DMI and DMD, whereas the inclusion of AH above 25% reduced DMI, DMD and OMD. The treatments had significant (p<0.05) effect on water intake and on live weight changes of lambs. Except for the diet containing 25% of AN browse, all lambs fed diets containing the saltbushes exhibited loss in body weight. The nutritive value of Atriplex nummularia foliage is better than that of A. halimus and it is possible to replace up to 50% of alfalfa hay by A. nummularia without negative effects on intake and digestibility of dry matter.

• 한국작물학회지
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• 제50권1호
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• pp.45-54
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• 2005

This study was carried out to investigate the patterns of dry matter (DM) production and accumulation, and to screen the relationships between related major growth characters and DM accumulation in four cassava varieties in Bogor $(6^{\circ}19'-6^{\circ}47'S,\;106^{\circ}21'-107^{\circ}13'E)$, West Java, Indonesia. Gading and Adiral developed an enough source and canopy in short at the early growth phase and then translocated assimilates to storage roots with a higher partitioning rate, even these varieties were considered as early-bulking varieties, which have superior source and sink potentials in increasing yield and DM of tubers. The root/shoot ratio (R/SR), total dry weight (TDW), leaf area duration, leaf area index (LAI), and number of tubers showed higher positive correlations with the dry weight of roots (DWR), and the direct effects of TDW, R/SR, and LAI on the DWR were higher. These characters were considered to be useful target characters to screen cassava varieties with high yield potential and high DM in aspect of tuber production.