乳牛における牛乳クエン酸濃度および乳成分との関係 Milk Citric Acid Levels and its Relations to Other Milk Constituents in Dairy Cows

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反芻動物では乳汁のクエン酸濃度が高く,それは乳汁の安定化などに大きく寄与するといわれるので,高泌乳牛における牛乳クエン酸濃度の実態と乳成分との関係について検討した.牛群検定事業に参画の2牧場においてホルスタイン種乳牛(延べ103頭:初産38,2産次以降65頭)から毎月1回ずつ牛乳試料を採取し(初産165点,2産次以降348点),クエン酸濃度を測定した.クエン酸濃度の範囲は0.09~0.24%で,平均は0.15%であった.初産牛と2産次以降のウシでクエン酸濃度に差はなかったが,分娩直後には高い傾向にあり,0.15%(全体の平均)よりも低い場合には乳糖率も低い例が多かった.乳脂肪率と乳タンパク質率には正の相関があったが,両乳成分ともクエン酸との比率(クエン酸比)として関係をみると非常に高い相関が得られた.

To clarify the milk citric acid level and its relations to milk quality in dairy cows, monthly milk samples were taken for 1 year from lactating dairy cows (165 and 348 samples from primiparous and multiparous, respectively) in 2 dairy farms, and citric acid and other milk constituents were measured. The mean and range of milk citric acid levels were 0.15 and 0.09-0.24%. There were many cases of higher citric acid levels in the early postpartum period, however, there was no difference in citric acid levels between primiparous and multiparous cows. In cases where citric acid concentrations were lower than 0.15%, milk lactose level was lower in the many samples. Relative fat and relative protein to citric acid levels (fat/citr. and protein/citr.) showed higher positive correlations than the relations between fat and protein levels, though no clear relations were observed between milk citric acid and fat or protein levels.

収録刊行物

  • 日本畜産學會報 = The Japanese journal of zootechnical science  

    日本畜産學會報 = The Japanese journal of zootechnical science 69(4), 381-386, 1998-04-25 

    Japanese Society of Animal Science

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各種コード

  • NII論文ID(NAID)
    10021726463
  • NII書誌ID(NCID)
    AN00195188
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1346907X
  • データ提供元
    CJP書誌  J-STAGE 
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