The experiment aim to breed an early-maturing variety of Italian ryegrass (Lolium multiflorum Lam.). It was conducted at the Grassland and Forage Crops Division, National Institute of Animal Science, RDA, Cheonan, Korea, from 2022 to 2023. The new variety named “Oasis” is a diploid with green leaves and has a semi-erect growth habit in late fall, and an erect growth habit in early spring. With a heading date of May 10, Oasis is categorized as an early-maturing variety. Compared with the “Florida80” as a control variety, Oasis’s flag leaf was 1 mm wider and 2 cm shorter, while the plant length was 7.8 cm longer. Additionally, the ear of Oasis was 1.2 cm longer than that of Florida80, and it showed lodging resistance. The dry matter yield of Oasis (8,805 kg/ha) was higher than that of Florida80. The total digestible nutrient and crude protein contents of Oasis were 64.5%, and 9.3%, respectively, which were 1.1% and 0.6% higher than those of Florida80, respectively. The neutral and acid detergent fiber contents in Oasis were 54.2% and 30.8%, respectively, which was 1.9% and 1.4% lower than those of Florida80, respectively. These results indicate that Oasis has good dry matter yield in the most of region and especially, middle and northern region of South Korea.

Ⅰ. INTRODUCTION
Ⅱ. MATERIALS AND METHODS
    1. Cross combination composition
    2. Production of synthetic seed varieties
    3. Productivity and regional adaptability evaluation
    4. Feed value analysis
Ⅲ. RESULTS AND DISCUSSION
    1. Variety characteristics
    2. Cold resistance
    3. Yield ability
    4. Feed value
Ⅳ. CONCLUSIONS
Ⅴ. ACKNOWLEDGEMENTS

• Jae Hoon Woo(Grassland and Forage Division, National Institute of Animal Science, RDA, Cheonan 31000, Republic of Korea)
• Bo Ram Choi(Grassland and Forage Division, National Institute of Animal Science, RDA, Cheonan 31000, Republic of Korea)
• Sang-Hoon Lee(Grassland and Forage Division, National Institute of Animal Science, RDA, Cheonan 31000, Republic of Korea)
• Ki-Won Lee(Grassland and Forage Division, National Institute of Animal Science, RDA, Cheonan 31000, Republic of Korea) Corresponding author