共轭亚油酸对五龙鹅生长发育和脂质代谢的影响

Effect of Dietary Conjugated Linoleic Acid on the Growth and Lipid Metabolism of Wulong-geese

1日龄五龙鹅192只,随机分为4个处理,分别饲喂共轭亚油酸(CLA)水平为0.0、5.0、15.0和25.0 g/kg的日粮,通过测定不同生长阶段的体增重(BWG)、采食量(FI)、料重比(F/G)、腹脂率(AFP),以及与脂质代谢有关血清生化指标,研究不同水平CLA日粮对五龙鹅生长发育和脂质代谢的影响。结果表明:在日粮中分别添加5.0g/kg和15.0 g/kg CLA,对五龙鹅BWG无显著影响(P>0.05),能够显著降低FI和F/G(P<0.05);显著降低AFP和血清甘油三酯(TG)、胆固醇(TC)、极低密度脂蛋白(VLDL)含量(P<0.05或P<0.01),增加了血清高密度脂蛋白胆固醇(HDL-C)含量和高、低密度脂蛋白胆固醇之比(HDL-C/LDL-C)(P<0.05)。日粮中添加25.0g/kg CLA,极显著地降低了FI和AFP(P<0.01),对血清TG、TC、HDL-C、VLDL含量和HDL-C/LDL-C的影响差异不显著(P>0.05)。适宜添加CLA对五龙鹅的生长发育和脂质代谢具有很好的促进和调节作用,即在五龙鹅的整个生长期内,CLA添加量不高于15.0 g/kg时,不但能在不影响BWG的前提下提高饲料利用率,而且能够通过降低脂肪沉积和调节脂质代谢起到预防动脉粥样硬化的作用;但过多添加CLA(25.0 g/kg)会使五龙鹅的生长发育受到抑制。

One hundred and ninety two Wulong-geese of one day old were selected and divided into four groups at random. They were fed diets of different CLA levels respectively （0, 5.0, 15.0 and 25.0 g/kg）, the body weight gain （BWG）, feed intake （FI）, the ratio of feed and gain （F/G）, the abdominal fat percentage （AFP） of different growing stages and a few serum biochemical indexes about lipid metabolism were measured to investigate the effects of different levels of dietary conjugated linoleic acid（CLA） on the growth and lipid metabolism of Wulong geese. The results showed that 5.0 g/kg and 15.0 g/kg dietary CLA had no significant effect on the BWG of Wulong geese （P 〉 0. 05）, while the FI and F/G were decreased significantly （P 〈0.05）, the AFP and the content of serum TG, TC, VLDL were decreased significantly or very significantly （P〈0.05 or P〈 0.01） and the content of serum HDL-C and the ratio of HDL-C/ LDL-C were increased significantly （P〈0.05）. 25.0 g/kg dietary CLA decreased FI and AFP very significantly （P〈0.01）, and had no significant effect on serum TG,TC,HDL-C,VLDL and HDL-C/LDL-C （P 〉 0. 05）. Appropriate amounts of dietary CLA could better promote the growth and regulate the lipid metabolism of Wulong geese, that＇s to say, on the whole growing stage of Wulong geese, when dietary CLA was no higher than 15.0g/kg, it could not only improve the feed utilization ratio of Wulong geese on the premise that have no effects on BWG, but also prevent atherosclerosis by reducing fat deposition and regulating lipid metabolism; but superfluous supplementation of CLA would restrain the growth of Wulong geese .