は,加えられた飼料で飼育された小牛の成長に重要な役割を果たします

Masoumeh Eghtedari¹, Amin Khezri¹, Mehdi Kazemi-Bonchenari²

¹Department of Animal Science, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman 76169-1-3439, Iran.

Animal nutrition (Zhongguo xu mu shou yi xue hui)

|August 22, 2025

まとめ

乳牛の飼料の添加は成長を促進しますが,十分なリン (P) は不可欠です. 飼料でPを0.8%に増やすと,栄養素の消化能力,微生物のタンパク質合成,特にフィテート-Pを含むスターターの性能が向上する.

科学分野:

動物科学
類の栄養
乳牛の管理

背景:

スターターダイエットに飼料添加 (FA) は,小牛の反性の発達に有益ですが,スターター摂取と成長を減少させることができます.
機能の低下は,未熟な反性の微生物群の餌の利用能力の低下から生じる可能性があります.
(P) は微生物の活動に不可欠ですが,乳牛の食物繊維との相互作用についてはあまり研究されていません.

研究の目的:

栄養補給された小牛の摂取量とパフォーマンスの低下を促すという仮説を検証する.
飼料の摂取量 (アルファルファ・ヘインなし vs アルファルファ・ヘイン) とP値 (0.4% vs 0.8%) が,小牛の成長,栄養素の消化性,反性の発酵,微生物のタンパク質合成 (MPS) に及ぼす影響を評価する.

主な方法:

48頭のホルシュタインの小牛は,P0.4% (NAH-0.4P),P0.8% (NAH-0.8P),P0.4% (AH-0.4P),P0.8% (AH-0.8P) のアルファルファ・ヘインを投与した.
離乳前 (d3−53) から離乳後 (d54−73) までの食事が与えられました.
測定には,MPSの指標として成長性能,栄養素の消化性,乳発酵のパラメータ,尿経ピューリン分泌が含まれていた.

主要な成果:

0. 8% P (AH- 0. 8P) でアルファルファの花粉を摂取した小牛は,離乳前の摂取量が最大で,離乳後の平均日益,体重,身長が改善した.
0. 8% のPレベルは,有機物質と中性洗剤繊維の消化性を高め,全短鎖脂肪酸の産生を高め,0. 4% のPと比較して,尿中のアンモニア窒素と尿中の窒素の排泄を減少させた.
アルファルファ・ヘイは,酸塩を増加させ,プロピオネートを減少させ,ブチラートを減少させ,離乳前のpHを増加させました.AH-0.8Pは,MPSの改善を示しました.

結論:

乳牛の成長性能を向上させる大きな可能性がある.
現在推奨されている約0.45%の食事中のPレベルは,特にフィテート-Pが高い飼料ベースのスタートアップでは,最適な繊維の消化性,MPS,および成長には不十分である可能性があります.
Pを0.8%に増やすことは,特に飼料を含んだ場合,若い小牛にとって有益です.

キーワード:

アルファルファ・ヘイン乳牛リンルーメン発酵

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