哺乳期ホルシュタイン乳牛の食事における未分解および物理的に有効な繊維の関係
W A Smith1, K Ishida2, J W Darrah1
1William H. Miner Agricultural Research Institute, Chazy, NY 12921.
Journal of dairy science
|February 12, 2026
まとめ
乳牛の食事における高濃度の未分解NDF (uNDF240) と物理的に有効なNDF (peNDF) は,乾物摂取とエネルギー補正ミルク (ECM) 生産に影響を及ぼした. uNDF240とpeNDFの相互作用は,噛む行動と反性の発酵に影響を与えました.
科学分野:
- 動物科学 動物科学
- 類の栄養について
- 乳牛の飼育 牛の飼育 牛の飼育
背景:
- 食物繊維の成分,特に物理的に有効なNDF (peNDF) と240時間の体外発酵で分解されないNDF (uNDF240) は,反動物の健康と生産性にとって極めて重要です.
- これらの繊維分子の相互作用を理解することは,TMR製剤の最適化に不可欠です.
研究 の 目的:
- uNDF240とpeNDFの食中の濃度の変動がHolstein牛の乾物摂取量 (DMI),牛乳の産出と組成,の行動,牛の発酵,栄養素の消化能力に及ぼす影響を調査する.
- 新しいメトリック,物理的に有効なUNDF240 (peuNDF240) を使用して,繊維粒子の大きさと不分解性の組み合わせによる影響を評価する.
主な方法:
- 16頭のホルシュタイン牛を複製した4 × 4 ラテン四角形のデザインが採用され,低/高 uNDF240と低/高 peNDFの2 × 2の因数配列の食事を使用しました.
- ダイエットは,飼料と濃縮物の比率と小粒子の大きさを調整することで策定された.
- 測定対象には,DMI,牛乳収量および成分,噛む時間, ruminal pH,揮発性脂肪酸 (VFA),および栄養素の消化能力が含まれていた.
主要な成果:
- UNDF240とpeNDFの相互作用により,UNDF240とpeNDFが高い食事を与えられた牛のDMIが低下しました.
- エネルギー調整ミルク (ECM) 生産は,nndf240とpeNDFの両方によって影響を受け,食事のpeNDF240と相関していました.
- UNDF240の値が高くなったと, ruminal pH,アセテート対プロピオネート比,およびNDFの回転が遅くなったが,peNDFは食事時間およびDMI1単位あたりの反効率に影響した.
結論:
- 食物繊維の特性,特にnndf240とpendfは,乳母乳牛のDMI,ECM生産,および反機能を著しく調節する.
- 結合メトリックのPOENDF240は,粒子のサイズと繊維の分解不能性を効果的に統合し,動物の反応を予測するための貴重なツールを提供します.
- uNDF240とpeNDFの両方のレベルを最適化することは,乳牛の消化効率と牛乳生産の向上に不可欠です.
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