小刺猴头菌发酵浸膏多糖对肉鸡脂肪沉积的影响

为研究小刺猴头菌发酵浸膏多糖(Polysaccharides from the fermentation extract of Hericium caputmedusae,HFP)对肉鸡血清脂类指标、腹脂沉积、盲肠短链脂肪酸以及肝脏、肌肉、粪便中脂肪含量的影响,选用1日龄AA肉鸡240只,随机分为4个处理,每处理3个重复,每重复20只,分别饲喂含HFP为0、0.1%、0.3%和0.5%的日粮,试验期为42d。结果表明:1)日粮中添加HFP可显著降低14、28和42日龄肉鸡血液甘油三酯(TG)含量(P0.05),0.3%和0.5%水平的HFP添加组可显著降低肉鸡肝脏TG含量(P0.05);2)0.3%和0.5%水平的HFP添加组肉鸡的腹脂率显著低于对照组(P0.05);3)日粮中添加HFP对肉鸡体重、腿肌脂肪含量、胸肌脂肪含量、粪便脂肪含量无显著影响(P0.05);4)添加HFP可显著增加肉鸡盲肠丙酸含量(P0.05),显著降低盲肠乙酸和丙酸的比例(P0.05);5)变量间相关性分析表明,14日龄时,肉鸡盲肠丙酸含量与腹脂率显著负相关(r=-0.992),乙酸和丙酸的比例与腹脂率显著正相关(r=0.989);28日龄时,盲肠丙酸含量与血液TG含量显著负相关(r=-0.985),乙酸和丙酸的比例与血液TG含量显著正相关(r=0.996);42日龄时,乙酸和丙酸的比例分别与血液TG含量、腹脂率显著正相关(r=0.951,0.979)。以上结果提示,在肉鸡日粮中添加HFP可以显著降低血液TG含量,降低腹脂沉积,可能是通过调节肉鸡盲肠短链脂肪酸的含量和比例而促进机体脂类代谢。

Effects of polysaccharides from the fermentation extract of Hericium caput-medusae on the lipid deposition in broilers

The experiment was conducted to study the effects of dietary polysaccharides from the fermentation extract of Hericium caput-medusae (HFP) on the serum lipid indexes,abdominal fat,short chain fatty acid in caecum,and the lipid content in liver,muscles and excreta of broilers.A total of 240 one-day-old AA broilers were divided randomly into 4 groups with 3 replicates of 20 broilers each,and fed diets containing four concentrations of HFP (0,0.1%,0.3%,and 0.5%)during the 42 days study.The results showed that:1)Dietary supplementation with HFP significantly decreased (P<0.05) the serum triglyceride (TG) content,the levels of 0.3% and 0.5% significantly decreased (P<0.05) the liver TG content of broilers on day 14,28,and 42.2)The abdominal fat percent was significantly reduced (P<0.05) in the broilers fed with 0.3% and 0.5% of HFP than that of the control group.3)Dietary supplementation of HFP had no significant (P >0.05)effect on the body weight,lipid content in thigh muscle,breast muscle and excreta of broilers.4)Dietary supplementation with HFP significantly increased (P<0.05) the propionic acid content,and decreased (P<0.05) the rate of acetic acid and propionic acid in the caecum of broilers.5)On day 14,the propionic acid content in caecum was in a significantly negative correlation with the abdominal fat percent (r=-0.992),the rate of acetic acid and propionic acid was in a significantly positive correlation with the abdominal fat percent (r=0.989).On day 28,the propionic acid content was in a significantly negative correlation with the serum TG (r=-0.985),the rate of acetic acid and propionic acid was in a significantly positive correlation with the serum TG (r=0.996).On day 42,the rate of acetic acid and propionic acid was in a significantly positive correlation with the serum TG and the abdominal fat percent (r=0.951 and 0.979)respectively.It could be concluded that dietary supplementation with HFP could significantly reduce the TG content in serum,decrease the abdominal fat deposition,and improve the lipid metabolism of broilers,which might be achieved through regulating the short chain fatty acid content and the rate in the caecum of broilers.