Journal of The Korean Society of Grassland and Forage Science (한국초지조사료학회지)

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Effect of Rainfall after Cutting on Feed Value of Italian ryegrass

예취 후 강우가 이탈리안 라이그라스의 사료가치에 미치는 영향

  • Park, Hyung Soo (Grassland & Forages Division, National Institute of Animal Science) ;
  • Kim, Ji Hye (Grassland & Forages Division, National Institute of Animal Science) ;
  • Choi, Ki Choon (Grassland & Forages Division, National Institute of Animal Science) ;
  • Kim, Hyeon Seop (Grassland & Forages Division, National Institute of Animal Science)
  • Received : 2016.05.14
  • Accepted : 2016.09.06
  • Published : 2016.12.31
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Abstract

This study was conducted to determine the effect of rainfall after cutting on nutritive value of Italian ryegrass (Lolium multiflorum) hay. Fresh Italian ryegrass was treated with 3 days natural rainfall (56.5, 14.0 and 1.6 mm) after cutting without tedding. Rainfall effect on Italian ryegrass quality was evaluated based on Neutral detergent fiber (NDF) and acid detergent fiber (ADF), crude protein (CP), crude fat (CF), crude ash (CA) and non-fiber carbohydrate (NFC). The quality of Italian ryegrass was decreased with extending raining days. The content of neutral detergent fiber (NDF) was increased from 0.4 to 4.7% by 1 day advancement in raining. CF content was decreased from 8.1 to 32.8%. CP and CA contents did not change, but NFC content was decreased from 0.5 to 8.4%. The quality damage by the number of raining days after cutting Italian ryegrass was the lowest on the first day from exposure to rain.

본 연구는 건초 수확 철 강우 영향을 최소화하고 국내에서 건초생산 기회를 확대하기 위하여 강우가 예상되는 전날 예취하여 반전하지 않은 상태에서 비를 맞혔을 때 사료가치 변화에 미치는 영향을 구명하기 위하여 수행되었다. 예취 후 강우에 의한 사료가치 변화를 조사하기 위하여 강우가 예상되는 전날 예취하고 반전은 하지 않은 상태로 포장에서 3일간 비를 맞추면서 매일 09:00, 13:00, 17:00에 1일 3회 시료를 500 g을 채취하여 사료가치 변화를 조사하였다. 조사료의 섬유소의 주요 구성물질인 ADF와 NDF 함량은 강우일수가 늘어남에 따라 증가하는 것으로 나타났으며 조단백질(CP) 함량은 강우일수가 증가함에 따라 소폭 감소하는 경향을 보였으나 유의적인 차이는 보이지 않았다. 조지방(CF) 함량은 강우 1일째 8.1%, 강우 2일째 15.7%, 강우 3일째에 32.8%로 감소하여 다른 영양성분에 비하여 양분 손실이 가장 큰 것으로 나타났다. 조사료의 탄수화물 중 섬유질을 제외한 나머지 부분인 비섬유성탄수화물(NFC) 함량은 강우일수가 늘어남에 따라 감소하는 것으로 나타났는데, 강우 1일째는 약간 증가(0.5%)를 보이다 강우 2일째에 7.2% 감소하였으며 강우 3일째에 8.4% 감소하였다. 총 가소화 영양분(TDN) 함량과 상대사료가치(RFV)는 강우일수가 늘어날수록 감소하는 것으로 나타났으며 강우 1일째에는 감소폭이 작은 반면 강우 3일째에는 감소폭이 더욱 커지는 것으로 나타났다. 예취 직후 강우일수에 의한 이탈리안 라이그라스의 사료가치는 전체적으로 감소하나 강우 1일째의 품질 감소폭이 작기 때문에 비가 하루나 이틀정도 예상되면 강우 전날 예취하여 비가 그친 후에 반전을 실시하면 건초생산 기간을 단축시킬 수 있을 것으로 사료된다.

Keywords

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