Climatic change affects agricultural, environmental and livestock production. Forage productivity is highly dependent on the weather change. The Pyeongchang region has more difficulty in cultivation of Sorghum-Sudangrass hybrids (SSH) than other warm regions because of the cold weather. This experiment was carried out to analysis the agronomic characteristics, productivity, and nutritive value of three cultivars of Sorghum-Sudangrass hybrids in the Pyeongchang region from 2021 to 2022. Two harvests were taken in each year, and the agronomic characteristics, dry matter yield, and nutrient content of the whole SSH crops were determined. The plant height ranged between 281-291 cm and 165-172 cm in the first and second harvest, respectively. Plant height of Superdan (291±49 cm) was the highest in the first cut and Dairy mens Dream (172±30 cm) was the highest in the second cut time. Stem diameter ranged from 9.5 to 8.8 mm with Superdan having a higher level than the other two cultivars. The Dairy mens Dream variety produced significantly higher dry matter yield (15,695 kg/ha) than those of Superdan (14,584 kg/ha) and Supergreen (14,300 kg/ha) over a two-year experimental period. In terms of nutritional quality, the crude protein content, neutral detergent fiber and acid detergent fiber of SSH cultivars were analysed. There were no significant changes in the content of CP, ADF and NDF ranges among the cultivars. In addition, the Superdan cultivar had slightly higher CP content (10.17%) and was followed by Dairy mens Dream (9.84%) and Supergreen (9.54%) in the second cut time of 2-year average. Dairy mens dream had lower ADF and NDF values than other cultivars; however, no significant differences amongst cultivars in fiber content were observed. Therefore, these three cultivars displayed the potential growth characteristics, DM yield and nutritive values in Pyeongchang region. Hence, the SSH cultivars have a potential to withstand the climatic change and improve SSH productivity in the study area.

ABSTRACT
Ⅰ. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
    1. Study area and plot design
    2. Agronomic characteristics of SSH cultivars
    3. Nutrient values of SSH cultivars
    4. Statistical analysis
Ⅲ. RESULTS
    1. Effect of climatic factors in Pyeongchang region forSSH cultivars
    2. Growth characteristics and productivity of SSH cultivarsin Pyeongchang region
    3. Nutritional profile of SSH cultivars in Pyeongchangregion
Ⅳ. DISCUSSION
Ⅴ. CONCLUSIONS
Ⅵ. ACKNOWLEDGMENTS
Ⅶ. REFERENCES

• Jeong Sung Jung(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Palaniselvam Kuppusamy(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Ilavenil Soundharrajan(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Seung Hak Yang(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Hyung Soo Park(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Jae-Hoon Woo(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Ki Choon Choi(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea) Corresponding author
• Ouk Kyu Han(Department of Crops and Forestry, Korean National University of Agriculture and Fisheries, Jeonju 54874, Korea)