Effects of Dietary Genistein on Nutrient Use and Mineral Status in Heat-Stressed Quails

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Genistein is a powerful antioxidant and plays a role in calcium and bone metabolism. We evaluated the efficacy of dietary supplementation with genistein on the nutrient use and mineral concentrations in tibia and serum of quails reared at high environmental temperature (34°C). Two hundred and forty Japanese quails (10 days old) were randomly assigned to 8 treatment groups consisting of 10 replicates of 3 birds. The birds were kept in a temperature-controlled room at 22°C (Thermoneutral, TN groups) or 34°C (for 8 h/d; 09.00 am-05.00 pm; Heat stress, HS groups). Birds were fed either a basal diet (TN and HS) or the basal diet supplemented with 200, 400 or 800 mg of genistein/kg of diet. Heat exposure decreased apparent nutrient digestibility and bone mineralization when the basal diet was fed (P<0.001). Apparent digestibility of dry matter (DM) (P<0.05), crude protein (CP) (P<0.05) and ash (P<0.01) was significantly improved by genistein supplementation. However, this improvement was not in direct proportion to increased doses of supplement since there was no difference when diets included either 400 or 800 mg genistein/kg of diet (P<0.05) in birds reared under heat stress. The amounts of Ca, P, Mg, Mn, Zn, Fe and Cu in the excreta decreased (P<0.01), while Ca, P, Mg, Mn, Zn and Cu concentrations in tibia ash increased in quails reared under heat stress conditions (P<0.01) with genistein supplementation. Ca and P concentrations in tibia ash were also increased in birds kept under thermoneutral conditions with genistein supplementation. Increased serum alkaline phosphatase activity (P<0.01) was associated with increasing dietary genistein in all groups. In conclusion, genistein supplementation to the basal diet improved digestibility of CP, DM and ash and levels of Ca and P and bone mineralization in quails reared under heat stress conditions.<br>

収録刊行物

  • Experimental animals  

    Experimental animals 55(2), 75-82, 2006-04-01 

    Japanese Association for Laboratory Animal Science

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各種コード

  • NII論文ID(NAID)
    10018114570
  • NII書誌ID(NCID)
    AA11032321
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13411357
  • NDL 記事登録ID
    7881025
  • NDL 雑誌分類
    ZS7(科学技術--医学)
  • NDL 請求記号
    Z54-H752
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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