初乳および新生子豚血清の遊離アミノ酸の動態  [in Japanese] Changes of Free Amino Acids in Sow Colostrum and Serum of Neonatal Piglets  [in Japanese]

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Abstract

新生期の子豚の栄養生理を把握する一環として, 豚乳および子豚血清の遊離アミノ酸の動態を分娩直後から1週間後にかけて調査した。<br>初乳の遊離アミノ酸は, Taurine が分娩24時間後まで大部分を占め, 全期間をとおして最も多く存在し, 80μmol/d<i>l</i> (脱脂乳) 以上で推移した。ほとんどのアミノ酸は, 分娩24時間後までわずかな量しか遊離の状態では存在せず, Methionine と Cystine は検出できなかった。しかし, 48時間以降になると非必須アミノ酸, 特に Glycine (Gly), Alanine (Ala), Aspartate, Glutamate および Glutamine が直線的に増加した。このため, 非必須アミノ酸総量 (NEAA) は分娩直後の15.64μmol/d<i>l</i> (脱脂乳) から1週間後には356.49μmol/d<i>l</i> (脱脂乳) と直線的に増加した。<br>子豚の血清遊離アミノ酸は, 出生直後ではGlyとAlaが最も多く存在し, アミノ酸総量の40%を占めた。また, 初乳中に遊離の必須および非必須アミノ酸がわずかな量しか存在しなかったにもかかわらず, 出生12時間後では血清の遊離の必須および非必須アミノ酸が著しく増加し, 分娩直後に比べて Tyrosine が8倍, Proline (Pro) が5倍の値を示した。Proは12時間から72時間後まで全てのアミノ酸で最も多く存在した。従って, 子豚の血清遊離アミノ酸は, 初乳の遊離アミノ酸の影響よりもペプチドや乳蛋白質の代謝の影響を強く受けていると推察される。

The concentrations of free amino acids in sow colostrum and serum of neonatal piglets were determined from farrowing to 1 week of lactation in this study.<br>The concentrations of total free amino acids, except for taurine were little, and methionine and cystine were no measurable in colostrum until 24 hours of lactation. Taurine was the most abundant free amino acid in sow milk through the experimental period and kept continually over 80μmol/d<i>l</i> in defatted milk. However, glycine, alanine, aspartate, glutamate, and glutamine were increased linearly, as time progressed after 48 hours of lactation. Thus, total nonessential amino acids were also increased linearly from 15.65μmol/d<i>l</i> at parturition to 356.49μmol/d<i>l</i> at 1 week of lactation in defatted milk.<br>Glycine and alanine were the most abundant serum free amino acids in neonatal piglets and amounted to 40% of total amino acids at birth (before suckling). Regardless of a small amount of free amino acids in colostrum, the concentrations of serum free essential and nonessential amino acids in neonatal piglets were increased drastically at 12 hours after birth. Especially, tyrosine and proline were increased eightfold and fivefold compared to those at birth, respectively. Proline is the most abundant serum free amino acid in neonatal piglets from 12 hours to 72 hours after birth. Therefore, we indicated that serum free amino acids in piglets would be affected by peptide and protein rather than free amino acids in colostrum.

Journal

  • Nihon Yoton Gakkaishi

    Nihon Yoton Gakkaishi 32(3), 193-199, 1995-09-20

    The Japanese Society of Swine Science

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Codes

  • NII Article ID (NAID)
    10008441033
  • NII NACSIS-CAT ID (NCID)
    AN10202971
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0913882X
  • Data Source
    CJP  CJPref  J-STAGE  JASI 
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