牧草ベースの乳系における新鮮牛期の飼料戦略:乳育期への代謝適応と卵巣循環の再開
Graciana R Mendina1, María de Lourdes Adrien1, Catalina Rivoir2
1Departamento de Ciencias Veterinarias y Agrarias, Facultad de Veterinaria, CENUR Litoral Norte, Universidad de la República, Paysandú 60000, Uruguay.
Journal of dairy science
|September 5, 2025
まとめ
産後21日間,総混合給食 (TMR) を摂取した乳牛の代謝プロフィールが改善されました. しかし,この戦略は卵巣循環の再開を加速させず,パリティ特有の乳生産反応を示した.
科学分野:
- 乳製品科学
- 動物の栄養
- 生殖生理学
背景:
- 乳牛の健康と生産性に 負のエネルギーバランスが影響します
- 乳児の早期の栄養戦略は,代謝適応に不可欠です.
- パリティは乳牛の代謝と生産性に影響する.
研究 の 目的:
- 乳母牛の代謝状態と生産性に対する,早期出産時のTMRの効果を評価する.
- この栄養戦略が卵巣循環の再開を加速するかどうかを判断する.
- 早期のTMRと,PMRの補給による伝統的な放牧の間の代謝と生産性の結果を比較する.
主な方法:
- 16匹の初生牛と24匹の複数生牛は,21日間のTMR収容 (T21) またはPMRの放牧 (T0) に割り当てられました.
- 代謝指標 (NEFA,グルコース,インスリン,IGF-1,BHB) とミルク生産をモニターした.
- 卵巣の周期性および代謝プロフィールを分析した.
主要な成果:
- T21 primiparous牛は代謝マーカーの改善 (低NEFA,高グルコース,インスリン,IGF-1) を示したが,乳生産の違いはなかった.
- T21の多乳牛は乳育の初期に乳の産量が高く,内分泌のプロフィールも改善した.
- 両群とも22日後に代謝変化を経験した.
- 卵巣循環の再開の違いは観察されなかった.
- メタボロミクスは,牧草原牛の脂質/筋肉の動員を増大させた.
結論:
- 乳児の早期の栄養戦略は代謝の適応に影響し,乳の産出にパリティ特有の効果がある.
- 21日間のTMRによる隔離は乳児の早期代謝プロフィールを改善しますが,卵巣の循環を早めることはありません.
- 産卵後の放牧は,初代牛の代謝ストレスを引き起こす可能性があります.
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