This experiment was carried out to examine double cropping system using Italian ryegrass (IRG) 'Kowinearly', whole crop rice 'Yeongwoo' and barnyard millet 'Jeju native' during the Oct. 2020 to Oct. 2022. Three kinds of forage crops were cultivated at paddy field in Livestock Institute, Jeollanamdo Agricultural Research and Extension Services, Jeollanamdo, South Korea. Whole crop rice (WCR) was sown in late May and barnyard millet (BM) sown early June each year after harvesting IRG. We examined dry matter yield and feed value of forage crops depending on harvest time of forage crops during the experimental period. The plant height in heading stage of IRG ranged from 108 to 112cm and dry matter yield ranged from 6,783 to 11,530 kg ha-1. The crude protein (CP) of IRG ranged from 6.0 to 8.44%, acid detergent fiber (ADF) ranged from 55.6 to 60.2% and neutral detergent fiber (NDF) ranged from 32.58 to 36.7%, The dry matter yield of WCR increased as the harvest stage was delayed (14,310 kg ha-1 in milk, 16,167 kg ha-1 in yellow ripen, and 18,891 kg ha-1 in mature). Similar to results of dry matter yield of WCR, dry matter yield of BM increased as the harvest stage was delayed (11,194 kg ha-1 in late heading. and 14,308 kg ha-1 in mature), However nutrient content of WCR and BM showed a decreasing trend. As shown in above results, the productivity of WCR after harvesting IRG was shown to be high at paddy field in the southern region. However, BM also was appeared to have potential as summer forage crops.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
Ⅲ. 결과 및 고찰
    1. 동계사료작물 IRG 생산성 및 사료가치
    2. 사료 피와 사료용벼의 생산성
    3. 사료 피와 사료용 벼의 사료가치
    4. IRG+하계작물 작부조합의 수량비교
Ⅳ. 요약
Ⅴ. 사사
Ⅵ. REFERENCES

• 정종성(국립축산과학원) | Jeong Sung Jung (National Institute of Animal Science, RDA)
• 이세영(국립축산과학원) | Se Young Lee (National Institute of Animal Science, RDA)
• 오미래(국립축산과학원) | Mirae Oh (National Institute of Animal Science, RDA)
• 박형수(국립축산과학원) | Hyung Soo Park (National Institute of Animal Science, RDA)
• 윤아나(전라남도 축산기술연구소) | Ana Yun (Livestock Institute, Jeollanamdo Agricultural Research and Extension Services)
• 최기춘(국립축산과학원) | Ki Choon Choi (National Institute of Animal Science, RDA) Corresponding Author