Feed Efficiency Classification in Confined Texel Ewe Lambs: Relationships with Ruminal Fermentation, Nitrogen Metabolism, and Greenhouse Gas Emissions
囲い飼育のテクセル雌羊における飼料効率分類：ルーメン発酵、窒素代謝、温室効果ガス排出との関係 (AI 翻訳)
Charleni Crisóstomo Abdalla, Adibe Luiz Abdalla Filho, Rui José Branquinho de Bessa, Ricardo Lopes Dias da Costa, Letícia de Sousa Corrêa, Josiel Ferreira, Nathalya Sanchez, Vinicius Souza Pestana, Vagner Ovani, Adibe Luiz Abdalla, Helder Louvandini
🤖 gxceed AI 要約
日本語
本研究は、残差飼料摂取量（RFI）と残差増体量（RIG）に基づく飼料効率分類が、消化・発酵・代謝プロセスに一貫した差異を反映するかを検証した。38頭のテクセル雌羊を対象に、栄養摂取量、消化率、ルーメン発酵、窒素代謝、微生物タンパク質合成、温室効果ガス排出を測定したが、効率群間で有意な差は見られなかった。主成分分析では2つの生物学的勾配が確認されたが、効率群の分離は明確でなかった。飼料効率の差異は他の生理学的メカニズムに起因する可能性が示唆された。
English
This study examined whether feed efficiency classification based on residual feed intake (RFI) and residual intake and gain (RIG) reflects consistent differences in digestive, fermentative, and metabolic processes. In 38 confined Texel ewe lambs, no significant differences were found among efficiency groups in nutrient intake, digestibility, ruminal fermentation, nitrogen metabolism, microbial protein synthesis, or greenhouse gas emissions. Principal component analysis revealed two biological gradients but no clear separation by efficiency. The findings suggest other physiological mechanisms may determine feed efficiency.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本の畜産分野では、飼料効率の向上は生産コスト削減と環境負荷低減の両面で重要だが、本研究成果は基礎的な知見であり、GX政策や開示制度への直接的な関連は薄い。ただし、畜産由来の温室効果ガス排出削減に向けた研究の一環として、今後の応用が期待される。
In the global GX context
Globally, livestock production is a significant source of greenhouse gas emissions, and improving feed efficiency is a key strategy for mitigation. This study provides basic insights into the physiological mechanisms underlying feed efficiency, which could inform future breeding and management practices. However, the lack of significant differences among efficiency groups suggests that more research is needed to identify effective interventions.
👥 読者別の含意
🔬研究者:Provides evidence that feed efficiency classification may not align with digestive and metabolic traits, suggesting other mechanisms are at play.
🏢実務担当者:Limited direct applicability; may inform livestock management strategies but no immediate actionable insights for sustainability reporting.
🏛政策担当者:Not directly relevant to policy; could be background for agricultural emission reduction strategies.
📄 Abstract（原文）
Feed efficiency classification based on residual feed intake (RFI) and residual intake and gain (RIG) is widely used to identify biologically efficient animals, yet it remains unclear whether this classification reflects consistent differences in digestive, fermentative, and metabolic processes. This study evaluated the effects of RFI and RIG classification on nutrient intake, apparent digestibility, ruminal fermentation, nitrogen metabolism, microbial protein synthesis, and gaseous emissions in confined lambs. Thirty-eight weaned Texel ewe lambs underwent a 60-day performance test using an automated feed intake system and were classified as high-efficiency, neutral, or low-efficiency based on both indices. Animals were individually housed in respirometric chambers where emissions of methane, carbon dioxide, nitrous oxide, and ammonia were assessed by cavity ring-down spectroscopy; apparent digestibility was determined from total collections of feed, orts, faeces, and urine; microbial protein synthesis was estimated from urinary purine derivatives; and ruminal short-chain fatty acid profiles were determined by gas chromatography. Feed efficiency classification did not significantly affect body weight, nutrient intake, apparent digestibility, ruminal fermentation parameters, nitrogen balance, microbial protein synthesis, or greenhouse gas emissions. Principal component analysis revealed two major biological gradients related to nutrient intake and utilisation (42.9%) and ruminal fermentation and gaseous emissions (23.3%), together explaining 66.2% of total variance, but showing no clear separation among efficiency groups. These findings indicate that the digestive, fermentative, and nitrogen metabolism variables evaluated in this study did not account for the observed variation in feed efficiency. Because the regression underlying RIG explained little additional variation (R2 = 0.01), these conclusions primarily reflect feed efficiency as classified by RFI, suggesting that other physiological mechanisms may play a more important role in determining feed efficiency in confined Texel ewe lambs.
🔗 Provenance — このレコードを発見したソース
- crossref https://doi.org/10.3390/ani16162554first seen 2026-08-18 05:24:05
🔔 こうした論文の新着を逃したくない方は キーワードアラート に登録（無料・3キーワードまで）。
gxceed は公開メタデータに基づく研究支援データセットです。要約・翻訳・解説は AI 支援で生成されています。 最終的な解釈・検証は利用者が原典資料に基づいて行うことを前提とします。