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當前位置首頁 » 脂肪酸營養研究中心 » 脂肪酸營養與代謝研究 » 日糧中不同能量和膽汁酸水平對肉雞生長性能和脂質代謝的影響

日糧中不同能量和膽汁酸水平對肉雞生長性能和脂質代謝的影響

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掃一掃!日糧中不同能量和膽汁酸水平對肉雞生長性能和脂質代謝的影響掃一掃!
瀏覽:- 發布日期:2019-08-19 15:00:46【

Effects of diets with different energy and bile acids levels on growth performance and lipid metabolism in broilers

子弹视频 This experiment was conducted to evaluate the effects of bile acids (BAs) on the growth performance and lipid metabolism of broilers fed with different energy level diets. 480 one-day-old Arbor Acres broilers (45.01 ± 0.26 g) were allotted to a 2 × 2 factorial design with 2 levels of energy (basal or high-energy level) and 2 levels of BAs (with or without BAs supplementation), resulting in 4 groups of 8 replicates; the experiment lasted 42d. High-energy diets decreased the feed/gain ratio (F/G) from 1 to 21d (P < 0.05), and increased the liver index and abdominal fat percentage at 42d (P < 0.05). The serum total triglyceride (TG) and high-density lipoprotein cholesterol at 42 d were increased by high-energy diets (P<0.05), while the hepatic lipoprotein lipase (LPL) activity at 21 and 42d was decreased (P< 0.05). BAs supplementation increased the body weight at 21d and decreased the F/G during entire period (P < 0.05), as well as improved the carcass quality reflected by decreased abdominal fat percentage at 42d and increased breast muscle percentage at 21 and 42d (P < 0.05). The serum TG at 21 and 42d were decreased by BAs (P < 0.05), and the hepatic LPL activity at 42d was increased (P < 0.05). In addition, high-energy diets increased the expression of sterol regulatory element binding transcriptio factor 1, acetyl-CoA carboxylase, and fatty acid synthase (P < 0.05), while BAs diets decreased these genes expression (P < 0.05). Moreover, BAs supplementation also increased the expression of carnitine palmitoyltransferase 1 (P < 0.05), which was increased in high-energy groups (P < 0.05). In conclusion, BAs supplementation could increase growth performance, elevate carcass quality, and improve lipid metabolism in broilers.

Key words:  bile acids, broiler, energy, growth performance, lipid metabolism

子弹视频 日糧中不同能量和膽汁酸水平對肉雞生長性能和脂質代謝的影響

摘 要:本實驗旨在研究膽汁酸(BAs)日糧中不同能量水平下添加膽汁酸對肉雞生長性能和脂質代謝的影響。480只1日齡AA肉雞(45.01±0.26 g)采用2×2因子設計,兩個能量水平(基礎組和高能組),兩個膽汁酸梯度(添加組和不添加)組,試驗分為4組,每組8個重復,試驗期42 d。高能組21 d時料肉比顯著降低(P<0.05), 42 d時肝臟指數和腹脂率顯著增加(P<0.05)。高能組42 d血清總甘油三酯(TG)、高密度脂蛋白膽固醇含量顯著升高(P<0.05),而21 d和42 d肝脂蛋白酯酶(LPL)活性顯著降低(P<0.05)。添加BA可顯著提高21 d體重,降低全程料肉比(P<0.05),并顯著改善42 d胴體品質,表現為腹脂率顯著降低,21 d和42 d胸肌率顯著增加(P<0.05)。添加BA可顯著降低21 d和42 d血清甘油三酯(TG)含量,提高42 d肝脂蛋白酯酶活性(P<0.05)。此外,高能組固醇響應元件結合轉錄因子1、乙酰輔酶A羧化酶、脂肪酸合成酶的表達顯著提高(P<0.05),而添加BA則顯著降低了這些基因的表達(P<0.05)。另外,添加BAs還能顯著提高肉堿棕櫚酰轉移酶1的表達(P<0.05),其在高能組顯著提高(P<0.05)。綜上所述,添加BA可以提高肉雞生長性能,改善胴體品質,促進脂質代謝。

關鍵詞:  膽汁酸;肉雞;能量;生長性能;脂質代謝

全文要點:

1、膽汁酸可顯著提高日增重,降低料重比;

2、膽汁酸可提高胸肌率1.4%,顯著降低42 d高能組肝臟指數、腹脂率,表明膽汁酸能使用更多的營養物質促進肌肉生長而不是脂肪沉積;

3、膽汁酸可提高血清肝脂蛋白酯酶(血清總甘油三酯水解成脂肪酸的限速酶)的活性,降低血清脂肪酸水平,從而降低肝臟或腹部脂肪的沉積;

4、膽汁酸能夠激活FXR受體。通過抑制SREBF1/FAS/ACC(脂肪合成基因)表達,從而抑制脂肪生成;膽汁酸能夠提高CPT1/PPARα(脂肪代謝基因)表達。最終,膽汁酸通過調節脂質代謝相關基因的表達,促進脂肪分解,抑制脂肪合成,減少脂肪沉積。

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