Oats (Avena sativa L.), which are known as one of the forage crops of Korea, have good livestock palatability and are popular to cattle farmers because of their high dry matter. However, the cultivation of double cropping in the rice field was reluctant due to the late maturing for farmers to plant rice continuously. 'Hi-early', a winter oats for forage use, was developed by the breeding team at National Institute of Crop Science, RDA in 2016. It was derived from a cross between ‘517A2-121’(IT133383) and ‘CI7604’ (IT133379). Subsequent generations followed by the cross were handled in bulk and pedigree selection programs at Suwon, Iksan and Jeonju, respectively. After preliminary and advance yield test for 2 years, ‘SO2004015-B-B-23-1-3-7’, designated as a line name of ‘Gwiri92’, were subsequently evaluated for earliness and forage yield during 3 years in four parts such as Jeju (upland), Yesan (upland), Iksan (upland), and Jeonju (paddy), from 2014 to 2016, and finally named as ‘Hi-early’. Cultivar ‘Hi-early’ has the characteristics of medium leaves of green color, thick diameter culm, and medium grain of brown color. Over 3 years, the heading date of ‘Hi-early’ was about 9 days earlier than that of check cultivar ‘Samhan’ (April 26 and May 5, respectively). Average forage fresh yield of ‘Hi-early’ harvested at milk-ripe stage was similar to check cultivar (40.2 tone ha-1 and 40.0 tone ha-1, respectively), and dry matter yield also was similar to check cultivar (14.2 tone ha-1 and 14.0 tone ha-1, respectively). Cultivar ‘Hi-early’ was lower than the check cultivar ‘Samhan’ in terms of the protein content (6.2% and 7.0%, respectively) and total digestible nutrients (61.0%, and 62.5%, respectively), while the TDN yield was more than the check (7.91 tone ha-1 and 7.64 tone ha-1, respectively). Fall sowing cropping of ‘Hi-early’ is recommended only in areas where average daily minimum mean temperatures in January are higher than -6°C, and it should not be cultivated in mountain areas, where frost damage is likely to occur.

Ⅰ. 서 론
 Ⅱ. 재료 및 방법
  1. 육성경위
  2. 시험방법
 Ⅲ. 결과 및 고찰
  1. 고유특성
  2. 생육특성
  3. 내재해성
  4. 조사료 생산성
  5. 사료가치
  6. 적응지역 및 재배상 유의점
 Ⅳ. 요 약
 Ⅴ. 사 사
 Ⅵ. REFERENCES

• 박태일(국립식량과학원, National Institute of Crop Science, RDA) | Tae-Il Park
• 김양길(국립식량과학원, National Institute of Crop Science, RDA) | Yang-Kil Kim
• 박형호(국립식량과학원, National Institute of Crop Science, RDA) | Hyung-Ho Park
• 오영진(국립식량과학원, National Institute of Crop Science, RDA) | Young-Jin Oh
• 박종철(국립식량과학원, National Institute of Crop Science, RDA) | Jong-Chul Park
• 강천식(국립식량과학원, National Institute of Crop Science, RDA) | Chon-Sik Kang
• 박종호(국립식량과학원, National Institute of Crop Science, RDA) | Jong-Ho Park
• 정영근(국립식량과학원, National Institute of Crop Science, RDA) | Young-Geun Cheong
• 김경호(국립식량과학원, National Institute of Crop Science, RDA) | Kyong-Ho Kim
• 최규환(전라북도농업기술원, Jellabuk-do, Agricultural Research and Extension Services) | Kyu-Hwan Choi
• 홍기흥(충청남도농업기술원, Chungcheongnam-do, Agricultural Research and Extension Services) | Ki-Heung Hong
• 채현석(국립축산과학원 난지축산연구소, Subtropical Animal Experiment Station, NIAS, RDA) | Hyun-Seok Chae
• 구자환(국립식량과학원 중부작물부, Central Area Crop Breeding Division, NICS, RDA) | Ja-Hwan Ku
• 안종웅(국립식량과학원 중부작물부, Central Area Crop Breeding Division, NICS, RDA) | Jong-Woong Ahn
• 한옥규(국립식량과학원 중부작물부, Central Area Crop Breeding Division, NICS, RDA) | Ouk-Kyu Han Corresponding author