Sorghum-Sudangrass hybrids (SSH) is a grass cereal hybrid crop with a high yield potential under different climatic conditions. The aim of this study was to evaluate the growth characteristics, dry matter yield and nutrient content of the SSH cultivars such as Dairy Mens Dream, Superdan and Supergreen from 2021 to 2023 in Jeju Island, Korea. Among the three cultivars, Superdan grew significantly taller with a larger stem diameter at both harvest times. In contrast, Dairy Mens Dream had least height and less stem diameter, but the dry matter yield was greater for Dairy Mens Dream than other cultivars. Furthermore, the crude protein content at the first cut was higher than 8.5% compared to the second cut (6.5 – 7.0%). The neutral detergent fiber (NDF) and acid detergent fiber (ADF) content was higher in the second harvest of all cultivars compared to the first harvest of SSH in 2021. The SSH cultivation in 2021 and 2023 had higher ADF and NDF content than in 2022, possibly due to the average precipitation and optimum temperature suitable for SSH production in 2021 and 2023. The selected three SSH cultivars showed significant growth characteristics, dry matter content, and nutritional value. The overall data suggested that all three SSH showed significant productivity and nutritional content in the Jeju region of sub-tropical climatic condition.

Ⅰ. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
    1. Description of study location and experiment design
    2. Analysis of CP, ADF and NDF in Sorghum-Sudangrasshybrids
    3. Statistical analysis
Ⅲ. RESULTS
    1. Effect of temperature and precipitation inSorghum-Sudangrass hybrid cultivars at Jeju region
    2. Growth characteristics and DM yield of differentSorghum-Sudangrass hybrids cultivars
    3. Nutritional value of different Sorghum-Sudangrasshybrids cultivars
Ⅳ. DISCUSSION
Ⅴ. CONCLUSIONS
Ⅵ. ACKNOWLEDGEMENTS
Ⅶ. REFERENCES

• 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)
• Jeong Sung Jung(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea)
• Yang Seung Hak(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)
• Ouk Kyu Han(Department of Crops and Forestry, Korean National University of Agriculture and Fisheries, Jeonju 54874, Korea)
• Ki Choon Choi(Grassland and Forages Division, National Institute of Animal Science, Cheonan 31000, Korea) Corresponding author