305-AA: 牛と環境の公平な比較を可能にする新しい国家標準化生産量測定法
Asha M Miles1, Paul M VanRaden1, Jana L Hutchison1
1Animal Genomics and Improvement Laboratory, Agricultural Research Service, USDA, Beltsville, MD 20705.
Journal of dairy science
|August 22, 2025
まとめ
更新された調整因子は,改良された遺伝的評価のために乳児の授乳率を標準化します. 新しい要因は,年齢,均等性,季節,地域を考慮し,管理の比較と酪農の育種プログラムの精度を高めています.
科学分野:
- 動物科学
- 乳製品科学
- 定量遺伝学
背景:
- 乳児産量標準化係数は1994年に最後に更新されました.
- 以来,各国の動物モデルでは,年齢対照の調整が更新されていますが,これらは以前は概要化されていませんでした.
- 精密な標準化は乳牛の遺伝子評価と管理の比較に不可欠です.
研究 の 目的:
- 牛乳,脂肪,タンパク質の乳房産量を標準化するための新しい増倍調整因子を推定する.
- 年齢,性別,季節,地理的地域に関する更新された要素を組み込む.
- 乳製品データベース内の遺伝子評価と管理比較の精度を向上させる.
主な方法:
- 1960年から2022年までの1億以上の哺乳記録を持つマルチトライトモデルを使用した.
- 9100万頭以上の動物の系統ファイルが含まれており,恒久的な環境効果と群れごとに相互作用が組み込まれています.
- 推定された新しい年齢相性因子 (5年期) 種と季節因子 (5年期) 気候地域
主要な成果:
- 広範囲にわたる哺乳期と血統データを用いて新しい増殖因子を導出しました.
- 年齢因子も標準化され 乳牛は36ヶ月で産卵し 現在の遺伝子評価方針に合致しています
- 季節的な影響は,環境影響を緩和する管理慣行が改善されたことを示すため,ここ数十年で減少した.
結論:
- 新しく推定された因子は,乳児の生産量を標準化するためのより正確で統一された方法を提供します.
- これらの更新された要因は,乳製品に関する全国のデータベースにおける遺伝的評価と管理の比較の精度を高めます.
- 乳牛の群れ管理と繁殖戦略を改善するために,これらの要因を広く採用することを奨励しています.
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