氧化应激对断奶仔猪生产性能和养分利用率的影响

试验选用24头断奶仔猪随机分为4组,每组6个重复,每个重复1头猪,将过氧化物值(POV)为11.78meqO2/kg的新鲜鱼油(FFO)和POV分别为399.81、701.62、1065.74meqO2/kg的氧化鱼油(OFO)以3%的比例加入到断奶仔猪日粮中,饲喂4周,旨在建立以氧化油脂为氧化应激源的氧化应激动物模型,初探氧化应激对断奶仔猪生产性能和养分利用率的影响。结果表明,氧化应激降低试验猪只生产性能和养分利用率。与FFO组相比,以POV为1065.74meqO2/kg的氧化鱼油作用效果最明显。该过氧化程度的氧化鱼油可使平均日增重降低8.16%,饲料增重比提高9.22%(P<0.05);氮表观消化率和表观利用率分别下降21.91%(P<0.001)和30.55%(P<0.001);干物质和粗脂肪表观消化率分别降低13.05%(P<0.05)和35.18%(P<0.05)。结论:在断奶仔猪日粮中添加3%的POV为1065.74meqO2/kg的氧化鱼油可诱导氧化应激,引起生产性能和养分利用率的下降。

Effects of oxidative stress on growth performance and nutrient digestibility in weaned piglets

The effects of oxidized fish oil on growth performance and nutrient digestibility of piglets were studied.In this experiment,twenty-four piglets were allotted randomly to four groups,six replicates of each group.Pigs in four groups were fed a diet supplemented with 3 % of fresh fish oil(peroxide value,POV,11.78 meqO2/kg)and oxidized fish oil(POV is 399.81 meqO2/kg,701.62 meqO2/kg and 1065.74 meqO2/kg,respectively) for 4 weeks.The results showed that the oxidized fish oil decreased growth performance and nutrient digestibility.Compared with fresh fish oil group,ADG decreased 8.16 %(P < 0.05) and F/G increased 9.22 %(P < 0.05) of the piglets fed the diet contaning oxidized fish oil (POV 1065.74 meqO2/kg),apparent digestibility of N,DM and lipid decreased 21.91 %(P < 0.01),13.05 %(P < 0.05) and 35.18 %(P < 0.05).Therefore,supplemented with 3 % oxidized fish oil with POV 1065.74 meqO2/kg could induce oxidative stress of piglets,depress performance and lower the nutrient digestibility.