• Journal of The Korean Society of Grassland and Forage Science
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• v.43 no.2
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• pp.116-121
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• 2023

This study was conducted in Cheonan of central region in South Korea to evaluate the forage characteristics of early-maturing Italian ryegrass (IRG) within September, 2021 to June, 2023. The three different varieties of Italian ryegrass were prepared in this study 'Kogreen', 'Kospeed' and 'Kowinearly'. The results of heading date in this study, 'Kogreen' was the earliest in among cultivars and recorded 24th of April, whereas 'Kowinearly' was recorded the latest. In case of plant length parameter, 'Kowinearly' was the highest, in addition lodge tolerance score 'Kowinearly' also superior in whole cultivars. The dry matter yield of 'Kowinearly' was recorded significantly the highest (11,027 kg/ha), in contrast 'Kospeed' was recorded significantly the lowest (8,455 kg/ha). As a result of ADF and NDF content 'Kospeed' was recorded excellent value as compared the other two cultivars. The CP content of this study was excellent in the order of 'Kospeed' > 'Kowinearly' > 'Kogreen'. In case of the monosaccharides content 'Kogreen' had relatively higher glucose and fructose content than other four cultivars, therefore the 'Kogreen' has advantage for preparing high quality of silage. In conclusion, among the three different early varieties of Italian ryegrass, 'Kowinearly' was the superior in forage productivity, 'Kospeed' was the highest in feed value and 'Kospeed' had the highest in glucose and fructose content.

• Journal of The Korean Society of Grassland and Forage Science
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• v.15 no.1
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• pp.37-42
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• 1995

This experiment was canied out to study the effects of seeding and harvesting dates on the growth of early and late maturing rye(Seca1e cereale L.) varieties at the forage testing field of S.N.U., Suweon, from September 1986 to May 1989. Leaf and tiller numbers of rye per plant were increased with earlier seeding date, but no difference in the tiller numbers was found between harvesting dates of early and late maturing rye varieties. Tiller dry weight of an early maturing rye veriety, Wintermore was higher than that of a late maturing rye variety, Kodiak when sown as early as September. Maximun leaf area index(LA1) and leaf area index duration(LA1D) were achieved with earlier seeding and early maturing rye varieties. A higher correlation between the maximum LA1 or LAID and dry matter accumulation of rye varieties was observed in this experiment.

• Journal of The Korean Society of Grassland and Forage Science
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• v.37 no.1
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• pp.44-49
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• 2017

This experiment was carried out to study the effect of rice black-streaked dwarf virus(RBSDV) infection rate on forage productivity of corn varieties in Cheonan of chungcheongnamdo from 2006 to 2008. Forage corn varieties of 10 were cultivated with first cropping(seeding in the last ten days of April) and second cropping(seeding in the last ten days of May) system in field and tested the infection rates of RBSDV and productivity of forage. The Infection rate of RBSDV was significant difference between corn varieties in middle district of Korea. Resistant corn varieties for RBSDV were 'Kwanganok', 'P3156', 'Kwangpeyongok' and 'P3394' but susceptible varieties were 'Suwon19', 'DK697', 'GW6959' and NC+7117. Dry matter(DM) yield of forage corn according with infection rates of RBSDV in field was significant difference between varieties(p<0.05). DM yield of susceptible varieties, 'Suwon 19', 'DK697' and 'GW6959' was lower about 20% than that of resistant varieties, 'Kwangpeyongok' and 'P3156'. For increasing the productivity of forage corn, recommend of resistant varieties for RBSDV and control of seeding time are very important in middle district of Korea.

• Journal of The Korean Society of Grassland and Forage Science
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• v.27 no.1
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• pp.53-56
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• 2007

A new orchardgrass (Dactylis glomerata L.) variety named "Kordione" has developed by the National Livestock Research Institute (NLRI) in 2005. To develope a new variety of orchardgrass, 5 superior clones were selected and polycrossed for seed production. Various agronomic growth paramaters and forage production of "Kordione" were examined at Suwon from 2001 to 2002. During 2003-2005, regional trials were conducted at Suwon, Pyungchang, Youngju, Iksan, and Jeju. "Kordione" showed a medium type growth habit in fall and spring, and short in length of flag leaf and upper internode. Plant height of "Kordione" was similar to that of standard variety, "Ambassador" and heading date was 2 days later than 10th May compared to Ambassador. "Kordione" showed enhanced winter hardiness, lodging tolerance and disease resistance compared to Ambassador. In addition, dry matter yield (12,081 kg/ha) of "Kordione" was also higher (11%) than that of the Amabassador. However, nutritive value was similar in both varieties.

• Journal of The Korean Society of Grassland and Forage Science
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• v.35 no.1
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• pp.26-30
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• 2015

A new tall fescue variety (Festuca arundinacea Schreb.) named 'Greenmaster2ho' was developed by the National Institute of Animal Science, Rural Development Administration, in Cheonan, Korea from 2010 to 2014. For the synthetic seed production of this new variety, 5 superior clones were selected and polycrossed: 09XFa02, 09XFa03, 09XFa11, 09XFa13, and 09XFa14. The agronomic growth characteristics and forage production capability of the seeds were studied at Cheonan from 2010 onward, and regional trials were conducted in Cheonan, Hoengseong, Jeju, and Jinju from 2012 to 2014. Greenmaster2ho showed resistance to disease, persistence, and regrowth ability that were all enhanced when compared with Fawn. At 15,119 kg/ha, the dry matter (DM) yield of Greenmaster2ho was 29% higher than that of Fawn, but the nutritive value of both varieties as forage was similar. This study aimed to make a contribution to the vitalization of the Korean grassland industry by developing a new tall fescue variety with excellent environmental adaptability.

• Journal of The Korean Society of Grassland and Forage Science
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• v.21 no.3
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• pp.157-162
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• 2001

"Hwasan 102" is a new cold-tolerant Italian ryegrass(Lo1ium rnultiflorum L.) variety developed by theNational Livestock Research Institute(NLRI) in 1999. Having cold tolerance in Italian ryegrass is an importantfor enlargement of cultivation area and increase of productivity in Korea. To develop the cold-tolerant varietyof Italian ryegrass, cold-tolerant clones survived under - 13- - 14$^{\circ}$C of minimum average air temperature(MAAT) in January were selected at Dun Nae, Kwangwon Province in 1993. Five of selected clones werepolycrossed for seed production by NLRI, RDA, in 1995."Hwasan 102" was tetraploid variety, dark green in leaf color and broad in flag leaf width. Also it hassemi-prostrate and medium growth habit in late autumn and in early spring, respectively. "Hwasan 102" withlow plant height at harvesting time was excellent in lodging tolerance. First heading date of "Hwasan 102"was 19th May, it was similar to that of Marshall. Expecially, "Hwasan 102" survived about 60% under - 10- - 12$^{\circ}$C of MAAT in January, so it could be cold-tolerant variety that can be safely cultivated in regionshigher than -9'C of MAAT in January. Compared with Marshall, "Hwasan 102" showed 8% higher freshyield (59.2MT per ha) but it showed 2% lower dry matter yield (9.6MT per ha). Higher IVDMD and TDNand lower ADF and NDF were observed in "Hwasan 102" than those of Florida 80 and Marshall in Foragequality.(Key words : Italian ryegrass, Cold tolerance, New variety "Hwasan 102")rshall in Foragequality.(Key words : Italian ryegrass, Cold tolerance, New variety "Hwasan 102")san 102&")ot;)

• Journal of The Korean Society of Grassland and Forage Science
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• v.24 no.3
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• pp.217-224
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• 2004

This study was carried out to select the promising forage crops for forage production in paddy field of HARI, RDA, Iksan from 1999 to 2001. The species of forage crop used in this experiment were barley(5 varieties), wheat(2), rye(3) and Italian ryegrass(IRG, 3). Stage of heading, milk and yellow ripe of barley were 26 $April{\sim}l$ May, middle May and late May, respectively. In milk to yellow ripe stage, dry matter(DM) yield of barley was $6.64{\sim}10.47$ MT per ha, and averaged ADF and NDF contents were $31.6\%\;and\;62.2\%$ respectively. Albori was the most promising variety among the barley). The growth of wheat was a little late compared to that of barley, but it seemed to be crop having higher forage yield md nutritive value. In milk to yellow stage, DM yield of wheat was $7.51{\sim}11.96$ MT per ha, and nutritive value of wheat was high(ADF $30.6\%$ and NDF $60.1\%$). Heading stage of rye was $25{\sim}27$ April, and it seemed to be suitable to harvest at heading to flowering stage because of heavy lodging after flowering. In flowering stage, DM yield of rye was 17.26 MT per ha, and nutritive value of rye was the lowest among 4 species(ADF $38.6\%$ and NDF $65.5\%$). Heading stage of early maturing IRG was 30 April and it seemed to be suitable for harvest at flowering stage of middle May in cropping system. In flowering stage, DM yield of early type IRG was 10.77 MT per ha, and averaged ADF and NDF contents were $31.6\%\;and\;59.2\%$, respectively. The results demonstrated that the promising forage crops for forage production in paddy field were rye, barley, early maturing IRG and wheat in Honam region. In Southern region, rye harvesting at early May was recommended when considered middle May of rice transplanting period, and barley(Albori) and early maturing IRG harvesting at middle May were recommended when considered late May of rice planting period. And also, wheat with high nutritive value and possibility for harvesting at late May were recommended in case of transplanting period at early June.

• Journal of The Korean Society of Grassland and Forage Science
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• v.16 no.1
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• pp.39-46
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• 1996

The experiment was conducted to inxvestigate matter production ability and growth characteristic variation for Italian ryegrass seed of introduced variety and the different seed production time of the next generation in paddy field at Iksan and Kyehwa experiment field from 1987 to 1988. Germination rate is good at seed production of 35 days before and after heading with introducced variety. Also, Early growth before wintering, dead leaf rate and regenerating day is same tendendy. Panicle numbers per hill like that and heading date is for 15~20 days after heading seed is late about three days, but 35 days before and after heading seed is early about one day. Fresh and drymatter yield at the different cutting time shows decrease in 15~25 days after heading seed but 35 days before and after heading seed is same or increase trend, it's notable at Kyehwa paddy field in reclaimed land. In case of feed value according to cutting time differ little against introduced seed.

• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.4
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• pp.279-284
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• 2020

This study aimed to analyze ruminal fermentation, methane emissions, and methanogen levels for different forage feed type and concentrate feed ratios. Alfalfa hay, oat hay, and a feed concentrate were used for in vitro fermentation experiments, at ratios of 9:1, 5:5, and 1:9 (forage:concentrate). After 24 h of incubation, rumen fermentation and methanogen level changes were evaluated. In the low forage treatments, the total gas, CH4, NH3-N, true dry matter digestibility, and total volatile fatty acid were higher than the other treatments, which were used as the parameters on which to assess rumen fermentation (P < 0.05). The feed ratio influenced the copy number for the total archaea and the genus Methanobrevibacter (P = 0.015, P = 0.010). The copy number result trend was like that for CH4 per digested dry matter (DDM). The PCR results and methanogen copy number analysis indicated that the composition of the methanogens affected the CH4 levels, not their copy number. The results of this study can be applied to predict rumen fermentation and methane emission patterns for cattle fed a variety of feedstuffs.

• Journal of Animal Science and Technology
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• v.64 no.2
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• pp.262-273
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• 2022

Under the four-cut system, low-lignin alfalfa (Medicago sativa L.) may extend harvesting intervals improving harvest management flexibility and producing forage products with higher nutritive values. The objective of this study was to compare forage yield and nutritive values of low-lignin and conventional alfalfa varieties when applied to six different harvest schedules in the first (2016) and second (2017) production years. There were 12 treatments of two alfalfa varieties as whole plots and six harvest schedules as subplots. Across harvest schedules, there were four cuttings in two production years. Three harvest intervals including "Standard" (high quality, HQ), "Standard+5-day" (medium quality, MQ), and "Standard+10-day" (high yield, HY) were chosen for the first cutting, and 30-day (HQ) and 35-day (HY) for the second cuttings. The third and fourth cuttings in 2016 were timed near final harvest date and in 2017 occurred at 35-day (MQ) and 40-day (HY). Variety by harvest schedule interaction was not significant, but the whole plot and sub-plot effects were significant. Hi-Gest 360 was consistently higher in nutritive value and with a similar yield as Gunner. Harvest schedules did not consistently differ in forage yield and nutritive values. HS-1 ("Standard" + 35-day + Medium Quality + High Yield) with shorter first two cutting intervals provided lower acid detergent fiber (ADF), neutral detergent fiber (NDF), higher relative feed value (RFV), and similar forage yield compared to other schedules. HS-1 had the highest economic incomes when considering RFV and yield among the six different harvest schedules.