马铃薯蛋白粉替代鱼粉对断奶仔猪生长性能、营养物质消化率及血清抗氧化指标的影响OA

[Objective]This study aimed to investigate the effects of isonitrogenous replacement of fish meal with potato protein powder on growth performance,nutrient digestibility and serum antioxidant indices of weaned piglets,so as to evaluate its application feasibility in diets for weaned piglets.[Method]A total of 60 healthy weaned piglets at 29 days of age with similar body weight(6.98 kg±0.11 kg)were selected and randomly divided into 2 treatments,with 6 replicates per treatment and 5 piglets per replicate.Piglets in control group were fed a basal diet,while those in experimental group received the basal diet with 2％potato protein powder for isonitrogenous substitution of fish meal.The trial lasted for 15 days.On day 15 of the trial,piglets were weighed on an empty stomach by pen,and daily feed intake was recorded per replicate to calculate growth performance.The number of diarrheal piglets in each pen was recorded daily to calculate diarrhea rate.Fresh fecal samples were collected from each pen during the last 3 days of the trial,mixed and treated with sulfuric acid for the determination of nutrient digestibility.Blood samples were collected from the anterior vena cava on day 12,and serum was separated to detect serum antioxidant indices.[Result]Compared with control group,the final body weight of weaned piglets in experimental group increased by 2.89％,the average daily weight gain increased by 6.23％,the average daily feed intake increased by 3.93％,and the feed conversion ratio decreased by 2.52％,but there were no significant differences(P>0.05).There was no significant difference in the diarrhea rate and mortality of weaned piglets between the experimental group and the control group(P>0.05).Compared with control group,the apparent digestibility of dry matter in weaned piglets of experimental group was significantly decreased(P<0.05),and there were no significant differences in the digestibility indicators of other nutrients(P>0.05).In terms of serum antioxidant indicators,compared with control group,the activity of glutathione peroxidase(GSH-Px)in the serum of weaned piglets in experimental group increased,and the content of malondialdehyde(MDA)decreased,but there were no significant differences(P>0.05).[Conclusion]Under the experimental conditions of this study,isonitrogenous replacement of fish meal with 2％potato protein powder in weaned piglet diets exerted no adverse effects on growth performance,nutrient digestibility and systemic antioxidant capacity,but significantly reduced the apparent digestibility of dry matter,which deserved attention.This substitution strategy possessed certain application potential,while its overall feasibility needed comprehensive evaluation combined with digestibility indicators.