γ-リノレン酸油摂取が肥育豚の背脂肪厚および肝臓の脂肪酸分解酵素活性に及ぼす影響 Effect of Dietary γ-Linolenic Acid-Enriched Oil on Backfat Thickness and Liver Fatty Acid Degrading Enzyme Activity in Growing Pigs

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本研究は,微生物由来でγ-リノレン酸を高濃度に含む油脂(GLA油)の摂取が,肥育豚の背脂肪厚および肝臓における脂肪酸分解酵素の活性にどのような影響を与えるかについて検討を行った.GLA油を1日当たり90g肥育豚に与え,基礎飼料は自由摂取として6週間にわたる飼養試験を行った.対照区には1日当たり90gの大豆油を与えた.供試豚は体重約69kgのランドレース×大ヨークシャー×デュロックの3元雑種,去勢豚13頭とした.背脂肪厚は体長1/2部位を超音波測定器を用いて毎週測定した.試験終了時にブタを屠殺して肝臓を採取し,カルニチンパルミトイル転移酵素およびペルオキシソームβ酸化活性を測定した.飼養成績の結果は,増体量,飼料摂取量および飼料効率いずれもGLA油区と対照区との間に差は認められなかった.背脂肪厚の増加量は両区共に週の経過と供にほぼ直線的に増加したが,GLA油区が低い傾向を示し,試験終了の第6週ではGLA油区が対照区に対して有意(P<0.05)に低い値を示した.肝臓におけるカルニチンパルミトイル転移酵素活性は,有意差は認められなかったもののGLA油区が対照区よりも高い傾向を示した.また,ペルオキシソームβ酸化活性は,対照区に対してGLA油区で有意(P<0.05)に高くなった.以上の結果より,肥育豚にGLA油を摂取させると背脂肪厚の増加量は抑制され,肝臓における脂肪酸分解酵素の活性は促進されることが示唆された.

We have previously reported that dietary γ-linolenic acid-enriched oil (GLA oil) reduces body fat content and increases liver enzyme activities related to fatty acid β-oxidation in rats. In this experiment, the effects of dietary GLA oil on backfat thickness and liver fatty acid degrading enzyme activities in growing pigs were investigated. Thirteen castrated pigs (Landrace×Large White×Duroc) weighing about 69kg were used. Pigs were given 90g of GLA oil or soybean oil (control) daily and free access to the basal diet during the experimental period of 6 weeks. The backfat thickness was measured weekly with an ultrasonic instrument at the half site of body length. Body weight gain, feed intake and feed efficiency in the GLA oil group were similar with the control group. The gain of backfat thickness in both groups increased almost linearly as time passed. However, that in the GLA oil group was significantly lower than in the control group on the 6th week. The activity of liver carnitine palmitoyltransferase in the GLA oil group, which is the rate-limiting enzyme of mitochondrial fatty acid β-oxidation, was higher than in the control group. Furthermore, liver peroxisomal β-oxidation activity in the GLA oil group was significantly higher than in the control group. These results suggested that dietary GLA oil reduces the gain of backfat thickness and increases the activities of liver fatty acid degrading enzymes.

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(5), 433-438, 1998-05-25 

    Japanese Society of Animal Science

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各種コード

  • NII論文ID(NAID)
    10021726084
  • NII書誌ID(NCID)
    AN00195188
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    1346907X
  • データ提供元
    CJP書誌  J-STAGE 
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