マダイにおける自己消化酵母タンパク質の栄養価 Evaluation of Dietary Yeast Autolysates for Red Sea Bream, Pagrus major

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マダイに対する自己消化酵母の消化性と栄養価について調べた。自己消化率は<I>Candida utilis</I>+<I>Rhodotorula gulutinis</I> (CRA) が最も高く, 次いで<I>Hasenula anomaly</I>+<I>R.gulutinis</I> (HRA) , <I>R.gulutinis</I> (RA) , <I>C.utilus</I>+<I>H.anomala</I> (CHA) , <I>C.utilus</I> (CA) および<I>H.anomala</I> (HA) の順に低下した。しかし, 魚粉の半量近くをこれら自己消化酵母に代替した飼料の見掛けの消化率には, 自己消化率と逆の傾向が得られ, CA, HAおよびCHA飼料で高かった。また, 魚粉の半量をCRA, HRAおよびCHAに代替した飼料を調製して56日間飼育したところ, CHA代替飼料で魚粉飼料と同等の優れた飼育成績が得られた。これらの結果から, 酵母の自己消化は栄養価の改善に直接結びつかなかったが, CHAはマダイに対して有望なSCPであることが示された。

Nutritive values of yeast autolysates, <I>Candida utilus</I> (CA), <I>Hansenula anomala</I> (HA) and <I>Rhodotorula glutinis</I> (RA), and their mixtures, <I>C. utilus</I> + <I>R. glutinis</I> (CRA), <I>H. anomala</I> + <I>R. glutinis</I> (HRA) and <I>C. utilus</I> + <I>H. anomala</I> (CHA) as a single cell protein (SCP), were evaluated by substituting near half of fish meal in a diet for red sea bream, <I>Pagrus major</I>. Apparent protein digestibilities of diets including CA, HA, CRA and CHA were similar to a control fish meal diet, but those of diets including RA and HRA were significantly lower than the control diet. Apparent lipid digestibilities of diets including CA, HA and RA, apparent sugar and energy digestibilities of diets excepting the diet including CHA were significantly lower than the control diet. Fish given diets including CRA and HRA maintained higher daily intake but lower feed efficiency, protein efficiency ratio, energy efficiency and apparent protein and lipid retentions than fish given the control diet. Therefore, the CHA was evaluated as useful dietary SCP for red sea bream, due to comparable weight gain, growth performance and digestibility to fish given the control diet.

Journal

  • Aquaculture Science

    Aquaculture Science 52(4), 387-394, 2004

    Japanese Society for Aquaculture Science

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