옥수수 사일리지 제조 시 세절 여부와 TMR 배합시간에 따른 젖소 TMR의 물리적 유효 NDF 함량 및 in situ 반추위 분해율에 미치는 영향
The effect of chopping corn silage and TMR mixing time on physically effective NDF in dairy cows and ruminal in situ dry matter disappearance
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초록
본 연구는 옥수수 수확 시 세절여부에 따라 제조된 옥수수 사일리지를 이용하여 TMR 제조시 배합시간에 따른 물리적 특성(Particle size 및 laceration)과 반추위 내 in situ 건물분해율에 미치는 영향을 조사하고자 수행되었다. TMR 시험사료는 세절(20 mm)한 것(T1구)과 세절하지 않은 옥수수 사일리지(T2구)를 이용하여 총 60분간 배합하면서 시료를 채취한 후Penn State Particle Separator(PSPS)로 분석하였다. 모든 배합시간에서 T2구보다 T1구에서상층(>19 mm)과 하층(<8 mm)이 유의적으로 낮았고(p<0.05), 중층(8-19 mm)은 유의적으로높았으며, 굵은 비율(≥1 mm)의 감소율도 높은 경향을 나타내었다. 그리고 peNDF>8.0 및 반추위 내 in situ 건물분해율도 T1구에서 유의적으로 높게 나타났다(p<0.05). 본 연구 결과에서 옥수수 사일리지 위주의 TMR 제조 시 세절하지 않은 것보다 세절한 옥수수 사일리지가적정 peNDF 범위가 유지되어 조사료로서 사료적 가치를 증진하는데 효과가 있을 것으로 기대된다.
Abstract
This study was conducted to evaluate the effect of chopped or unchopped corn forage oncharacteristics of corn silage, and the effect of mixing time on particle size, laceration, andruminal in situ dry matter degradation of TMR mixed with these corn silage. Samples werecollected from TMR mixed with chopped or unchopped corn silage for 60 minutes, and thenanalyzed by Penn State Particle Separator. The particle retention of T1 was significantly lowerin the top screen (19 mm) (p<0.05) and in the bottom pan (p<0.01), respectively, while it washigher in the middle screen (8 mm) (p<0.01) than that of T2. peNDF>8.0 was significantlyhigher in T1 (17.10-18.18%) than in T2 (14.69-16.41%) (p<0.01) after mixing for 60 minutes. Ruminal In situ dry matter disappearance of the particle retention (>19 mm) in T1 wassignificantly increased at 24 hours incubation (p<0.05). The results show that the chopped cornsilage may improve the nutritive value of forage as promising forage with maintaining adequatepeNDF.
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