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首页> 外文学位 >Growth performance and disease resistance of channel catfish (Ictalurus punctatus) fed diets containing natural gossypol and gossypol-acetic acid.
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Growth performance and disease resistance of channel catfish (Ictalurus punctatus) fed diets containing natural gossypol and gossypol-acetic acid.

机译：饲喂含有天然棉酚和棉酚乙酸的饲料的channel鱼（Ictalurus punctatus）的生长性能和抗病性。

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摘要

Two experiments were conducted to determine the effect of dietary gossypol on growth performance, hematology, immune response, and disease resistance of channel catfish to Edwardsiella ictaluri challenge. Fish averaging 6.22 ± 0.25 g and 6.47 ± 0.04 g were fed purified diets supplemented with gossypol (0, 100, 200, 400, 800 and 1600 mg/kg) from gossypol-acetic acid (G-AA) and practical diets containing natural free-gossypol (0, 100, 200, 400 and 800 mg/kg) from glanded-cottonseed meal (G-CSM) or G-AA, respectively, twice daily to apparent satiation for 12 weeks. Weight gain, feed intake and feed efficiency of fish fed purified diets linearly (P 0.001) decreased with increasing dietary gossypol levels. When practical diets were used, neither the sources nor the levels of dietary gossypol influenced these response criteria. Whole body moisture, fat, and ash, hematological values and serum protein linearly (P 0.001) decreased with increasing dietary gossypol levels in fish fed purified diets but not in fish fed practical diets. These data indicate that gossypol supplemented to purified diets appeared be more toxic than gossypol supplemented to practical diets. Chemotaxis ratio was enhanced in fish fed purified diets containing 277 mg/kg dietary gossypol (break point analysis) but not in fish fed practical diets. Gossypol accumulation in liver was linearly (R2 = 0.99) related to dietary levels of gossypol. The accumulation rate was higher in fish fed purified diets than in fish fed practical diets. Higher liver gossypol contents also were observed in fish fed practical diets containing gossypol from G-CSM as compared to those fed corresponding levels of gossypol from G-AA. These results indicate that part of the portion of total gossypol, besides free gossypol present in G-CSM, may be absorbed and deposited in the liver of catfish. Serum lysozyme activity significantly increased in fish fed dietary gossypol levels of 900 and 200 mg/kg or higher in purified and practical diets, respectively. Significantly increased superoxide anion (O2−) production was observed in fish fed practical diets containing gossypol at levels of 400 mg/kg from G-CSM or 800 mg/kg from G-AA. Antibody titer against E. ictaluri was not affected by type of diet and sources and levels of gossypol. Post-challenge mortality significantly decreased in fish fed purified diets containing gossypol at levels of 900 mg/kg or higher. When practical diets were used, neither the sources nor the levels of gossypol influenced the resistance of fish against E. ictaluri infection. Gossypol, even supplemented to purified diets, is of little or no benefit in improving the resistance of fish against E. ictaluri infection because the levels observed to enhance some immune parameters and survival of fish post-challenged with E. ictaluri were much higher than those found to be toxic to juvenile catfish.
机译：进行了两个实验，以测定日粮棉酚对河豚对 edtaliella ictaluri 攻击的生长性能，血液学，免疫反应和抗病性的影响。向平均6.22±0.25 g和6.47±0.04 g的鱼饲喂补充了棉酚乙酸（G-AA）的棉酚（0、100、200、400、800和1600 mg / kg）的纯化饲料和实用的天然饲料从棉籽粕（G-CSM）或G-AA中分别摄取-棉酚（0、100、200、400和800 mg / kg），每天两次至明显饱食12周。线性饲喂纯日粮的鱼的体重增加，采食量和饲料效率随日粮棉酚水平的增加而降低（P <0.001）。当使用实际饮食时，棉酚的来源和水平都不会影响这些反应标准。饲喂纯饲料的鱼体内总的水分，脂肪和灰分，血液学值和血清蛋白呈线性下降（P <0.001），但随着饲料中棉酚含量的增加，实际饲料中的总蛋白含量并未下降。这些数据表明，添加到纯饮食中的棉酚比添加到实际饮食中的棉酚毒性更大。在含有277 mg / kg日粮棉酚的纯饲料日粮中，趋化比提高了（断裂点分析），而在实际饲料中日粮中却没有增加趋化性。肝脏中的棉酚积累与饮食中的棉酚含量呈线性关系（R 2 = 0.99）。用纯饲料喂养的鱼比用实际饲料喂养的鱼的积累率更高。在饲喂含有来自G-CSM的棉酚的实际饮食的鱼中，与饲喂相应水平的来自G-AA的棉酚的鱼相比，肝脏中的棉酚含量也更高。这些结果表明，除了G-CSM中存在的游离棉酚外，总棉酚的一部分还可能被and鱼的肝脏吸收和沉积。在纯净和实际饮食中，饲喂鱼的日粮棉酚含量分别为900和200 mg / kg或更高时，血清溶菌酶活性显着增加。在喂食含有棉酚的实际饮食的鱼中，其超氧化物阴离子（O 2 -）的含量显着增加，G-CSM含量为400 mg / kg或鱼粉中含量为800 mg / kg G-AA。饮食类型以及棉酚的来源和水平均不会影响针对 italtal 的抗体效价。饲喂含有棉酚含量为900 mg / kg或更高的纯饲料的鱼，攻击后死亡率显着降低。当使用实际饮食时，棉酚的来源和水平都不影响鱼类对<斜体> E的抗性。 ictaluri 感染。棉酚，甚至补充纯净饲料，对提高鱼类对 E的抗性几乎没有好处。 italtal 感染，因为观察到的水平增强了 E攻击鱼的某些免疫参数和存活率。 ictaluri 远高于被发现对幼年cat鱼有毒的那些。

著录项

  • 作者

    Yildirim-Aksoy, Mediha.;

  • 作者单位

    Auburn University.;

  • 授予单位 Auburn University.;
  • 学科 Agriculture Fisheries and Aquaculture.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水产、渔业;
  • 关键词

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