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首页> 外文学位 >Effects of dietary crude protein and/or crystalline amino acid concentration on serum IGF-I concentrations and IGF-I mRNA expression in growing pigs.
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Effects of dietary crude protein and/or crystalline amino acid concentration on serum IGF-I concentrations and IGF-I mRNA expression in growing pigs.

机译：日粮粗蛋白和/或结晶氨基酸浓度对生长猪血清IGF-1和IGF-1 mRNA表达的影响。

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摘要

Three experiments were conducted to investigate the effects of increasing dietary crude protein (CP) and/or crystalline amino acid (AA) intake on growth performance, serum insulin-like growth factor-I (IGF-I) concentration, and IGF-I mRNA expression in growing-finishing pigs. All three experiments utilized crossbred pigs with an initial body weight of 34 kg in 28-d (exp. 1) or 26-d (exp. 2 and 3) growth assays. Dietary treatments used in the experiments were standard corn-soybean meal diets (10, 14, 18, 22% CP) or low-protein, amino acid-supplemented diets (10% CP + AA, 14% CP + AA, and 18% +AA). Pig and feeder weights were recorded weekly during all three experiments for the determination of ADG, ADFI, and feed efficiency (ADG/ADFI). Blood samples were collected weekly and analyzed for plasma urea and serum IGF-I concentrations. On d 26 (exp. 2 and 3) and d 28 (exp. 1), real-time ultrasound backfat (BF) and longissimus muscle area (LMA) measurements were recorded and used for the calculation of fat-free lean gain (FFLG). There was no difference (P > 0.10) in ADFI among treatments throughout the growth period in all three experiments. Dietary protein concentration had linear and quadratic effects on ADG and ADG/ADFI (P 0.01) in exp. 1 and 2. Results from experiment 3 showed that pigs fed the corn-soybean meal diets had greater ADG (P 0.05) and ADG/ADFI (P 0.05) than pigs fed the low-protein, amino acid-supplemented diets throughout the experiment. In exp. 2 and 3, IGF-I mRNA expression in the semitendinosus muscle increased as CP concentration increased in the diet. In all experiments, fat-free lean gain, plasma urea, and serum IGF-I concentration were increased (P 0.01) by dietary protein concentration. Results from these experiments suggest that the consumption of a diet deficient in CP (10 and 14%) inhibits the expression in semitendinosus muscle and production of IGF-I which was associated with a reduction in growth rate and carcass protein accretion.
机译：进行了三个实验，以研究增加饮食中粗蛋白（CP）和/或结晶氨基酸（AA）的摄入量对生长性能，血清胰岛素样生长因子-I（IGF-I）浓度和IGF-I mRNA的影响在育肥猪中表达。这三个实验均在28天（实验1）或26天（实验2和3）生长试验中使用了初始体重为34千克的杂交猪。实验中使用的饮食疗法为标准玉米-豆粕日粮（10％，14％，18％，22％CP）或低蛋白氨基酸补充日粮（10％CP + AA，14％CP + AA和18％ + AA）。在所有三个实验期间，每周记录猪和饲养者的体重，以确定ADG，ADFI和饲料效率（ADG / ADFI）。每周收集血样并分析血浆尿素和血清IGF-I浓度。在第26天（实验2和3）和第28天（实验1），记录了实时超声背脂（BF）和最长肌面积（LMA）的测量值，并用于计算无脂瘦肉率（FFLG） ）。在所有三个实验中，在整个生长期中，各处理之间ADFI的差异均无（P> 0.10）。日粮中蛋白质的浓度对ADG和ADG / ADFI有线性和二次影响（P <0.01）。参照图1和2。实验3的结果表明，饲喂玉米-豆粕日粮的猪在整个饲喂过程中均比饲喂低蛋白氨基酸日粮的猪具有更高的ADG（P <0.05）和ADG / ADFI（P <0.05）。实验。在实验中如图2和图3所示，随着饮食中CP浓度的增加，半腱肌中IGF-I mRNA的表达也增加。在所有实验中，饮食蛋白质浓度可增加无脂瘦肉，血浆尿素和血清IGF-I浓度（P <0.01）。这些实验的结果表明，食用缺乏CP的饮食（分别为10％和14％）会抑制半腱肌的表达和IGF-1的产生，这与生长速度的降低和car体蛋白质的积聚有关。

著录项

  • 作者

    Fischer, Robert L.;

  • 作者单位

    The University of Nebraska - Lincoln.;

  • 授予单位 The University of Nebraska - Lincoln.;
  • 学科 Agriculture Animal Culture and Nutrition.; Biology Animal Physiology.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 284 p.
  • 总页数 284
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 饲料;生理学;
  • 关键词

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