Oxidative stress and anti-oxidative potential were examined in beef cattle,pork pigs and meat-type chickens which were fed a diet supplemented with dried sweetpotato tops (DSPT).Oxidative stress and anti-oxidative potential in the plasma from each animal were estimated by the derivatives of reactive oxygen metabolites(d-ROM) and biological antioxidant potential(BAP),respectively.In the case of beef cattle,the d-ROM value increased in the control group fed a standard diet during the experiment,while the value did not changed in the intake of a diet supplemented with 5％ DSPT.The d-ROM value was significantly lower in the 5％ DSPT group than in the control group at 90-week-old.The BAP value did not change significantly and there was no difference between DSPT and the control group throughout the experiment.In the case of pork pigs,the d-ROM value was stable in the control group,while the value decreased in the 5％ DSPT group,and was significantly lower than the control group at 1 and 2 months after administration.The BAP value decreased both in the control and the DSPT groups and there was no difference between the DSPT and the control group during the experiment.In the case of meat-type chickens,the d-ROM value increased in the control group during the experiment,while the values were stable in the 5％ DSPT group and decreased in the 10％ DSPT group,and were significantly lower than the control group at 83 days after administration.The BAP values did not dramatically changed both in the control and the two DSPT groups,and there were no significant differences between both DSPT groups and the control group at any day during the experiment.The effect of SPT on lipid peroxidation of beef sirloin was examined by thiobarbituric acid reactive substances(TBARS) assay.The TBARS value was significantly lower in the DSPT group than the control group.The results suggest that SPT are a potent candidate for feed additives,which might maintain the health of livestock and improve the quality of edible meat by suppressing of oxidative stress.
National Agricultural Research Center for Kyushu Okinawa Region(KONARC),6651-2 Yokoichi,Miyakonojo,M Department of Biochemistry and Applied Biosciences,Faculty of Agriculture,University of Miyazaki,1-1 Miyazaki Livestock Research Institute,5066 Hirohara,Takabaru,Miyazaki 889-4411,Japan Miyazaki Livestock Research Institute,21986 Kawaminami,Miyazaki 889-1301,Japan Department of Nutrition Management,Faculty of Health and Nutrition,Minami-kyushu University,5-1-2 Ki