中链脂肪酸对断奶仔猪生长性能、营养物质表观消化率和血清指标的影响

Effects of Medium Chain Fatty Acids on Growth Performance,Nutrient Apparent Digestibility and Serum Indexes of Weaned Piglets

本试验旨在研究中链脂肪酸(MCFA)对断奶仔猪生长性能、腹泻、营养物质表观消化率和血清指标的影响。选取29日龄、体重[(6.83±0.44)kg]相近的断奶仔猪(杜×长×大杂交猪)300头,随机分为4组,每组3个重复,每个重复25头猪。对照组饲喂基础饲粮,试验组分别在基础饲粮中添加1、2、4 g/kg的MCFA。试验预试期5 d,正试期30 d。结果表明:与对照组相比,添加不同剂量的MCFA均显著降低了断奶仔猪粪便评分和腹泻率(P<0.05)。与对照组相比,添加4 g/kg MCFA显著提高了粗脂肪表观消化率(P<0.05),添加2和4 g/kg MCFA显著降低了血清丙二醛含量(P<0.05),而添加4 g/kg MCFA有提高血清超氧化物歧化酶活性的趋势(0.05<P<0.10);添加不同剂量的MCFA均显著提高了血清免疫球蛋白A的含量(P<0.05),而添加1和2 g/kg MCFA有提高血清免疫球蛋白M含量的趋势(0.05<P<0.10)。综上所述,饲粮添加MCFA增强了仔猪的抗氧化和免疫能力,缓解了断奶应激和腹泻;但本试验并未发现其能促进增重和提高饲料利用率。

This experiment aimed to investigate the effects of medium-chain fatty acids(MCFA)on growth performance,diarrhea,nutrient apparent digestibility and serum indexes of weaned piglets.Three hundred 29-day-old weaned piglets(Duroc×Landrace×large cross)with similar body weight[(6.83±0.44)kg]were ran-domly divided into 4 groups with 3 replicates per group and 25 pigs per replicate.The control group was fed a basal diet,and the experimental groups were fed the basal diets supplemented with 1,2 or 4 g/kg MCFA,re-spectively.The experiment lasted for 35 days including a 5-day transition period.The results showed as fol-lows:compared with the control group,dietary adding MCFA with different doses decreased the fecal score and diarrhea rate of piglets(P<0.05).Compared with control group,the apparent digestibility of ether extract of piglets fed 4 g/kg MCFA was higher(P<0.05).Piglets fed 4 g/kg MCFA had lower serum malondialde-hyde content(P<0.05)and trended higher serum superoxide dismutase activtiy(0.05<P<0.10)compared with control group.Compared with control group,dietary adding MCFA with different doses increased serum immunoglobulin A content(P<0.05).Compared with control group,adding 1 and 2 g/kg MCFA trended to increase serum immunoglobulin M content(0.05<P<0.10).In conclusion,MCFA can enhance antioxidant ca-pacity and immune ability,relive diarrhea and weaning stress in weaned piglets.However,this experiment find that it can not promote weight gain and improve feed utilization rate.