This study was conducted to analyze long-term trends in moisture content and regional distribution characteristics of winter forages produced in Korea. A total of 14,204 samples collected from forage production farms and TMR facilities across 128 Si/Gun units nationwide from 2015 to 2024 were analyzed for moisture content, and annual, regional, and species-specific trends were examined accordingly. The overall mean moisture content was 34.82 ± 16.68%, with a declining trend from 46.70% in 2015 to 30.71% in 2024. Among the forage species, Italian ryegrass showed the lowest mean moisture content (29.44 ± 13.31%), decreasing consistently from 41.16% in 2015 to 23.91% in 2024, contributing substantially to the overall declining trend. Regional variation in moisture content was associated with differences in forage storage type composition, with Gangwon province showing higher moisture content corresponding to a greater proportion of silage, while Jeonbuk province showed lower moisture content with a higher proportion of hay. No statistically significant correlations were found between moisture content and environmental factors including precipitation and drainage installation rate (p>0.05), suggesting that final moisture content is likely influenced by multiple factors beyond regional precipitation, highlighting the need for further studies including direct variables like post-harvest management. The proportion of hay increased from 7.8% in 2015 to 32.3% in 2024, while silage decreased from 43.9% to 15.0%, a trend that coincides with the implementation of the national forage quality grading system initiated in 2015, suggesting a possible association. These results provide baseline data for developing region-specific forage production and quality management strategies in Korea.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 시료 및 NIR 스펙트럼 분석
    2. 수분함량 분석 및 저장 형태 추정 방법
    3. 기상 데이터 수집 및 배수로 실태 조사
    4. 통계 분석
Ⅲ. 결과 및 고찰
    1. 국내 생산 조사료 시료의 수집 현황 및 분포 특성
    2. 국내 생산 조사료의 수분함량 분석
    3. 국내 생산 조사료의 형태별 분포 특성
Ⅳ. 요약
Ⅴ. 사사
Ⅵ. REFERENCES

• 정진우(국립축산과학원 조사료생산시스템과) | Jin woo Jeong (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 고하늘(국립축산과학원 조사료생산시스템과) | Ha neul Ko (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 김지혜(국립축산과학원 조사료생산시스템과) | Ji Hye Kim (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 민창우(국립축산과학원 조사료생산시스템과) | Chang Woo Min (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 박형수(국립축산과학원 조사료생산시스템과) | Hyung Soo Park (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 오미래(국립축산과학원 조사료생산시스템과) | Mi Rae Oh (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 이기원(국립축산과학원 조사료생산시스템과) | Ki Won Lee (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 정승민(국립축산과학원 조사료생산시스템과) | Seung Min Jeong (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 정종성(국립축산과학원 조사료생산시스템과) | Jeong Sung Jung (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea)
• 우제훈(국립축산과학원 조사료생산시스템과) | Jae Hoon Woo (Forages Production Systems Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Republic of Korea) Corresponding author