富含DHA微藻对柴达木福牛生长性能和血清抗氧化指标的影响

Effect of Dietary DHA-rich Microalgae on Growth Performance and Serum Antioxidant Indices of Qaidamford Cattle

本试验旨在研究富含二十二碳六烯酸(C22∶6n-3,DHA)的微藻对柴达木福牛生长性能、体尺指标、屠宰性能和血清抗氧化指标的影响。选用24头健康的24月龄柴达木福牛公牛,随机分为3组,每组8头。试验Ⅰ组(对照组)饲喂基础饲粮,试验Ⅱ和Ⅲ组在基础饲粮中分别添加100和200 g/d的微藻粉。预试期10 d,正试期42 d。测定生长性能、体尺指标、屠宰性能相关指标以及血清中总抗氧化能力(T-AOC)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性和丙二醛(MDA)含量。试验结果表明:①试验Ⅱ组平均日增重(ADG)显著高于对照组(P<0.05);与对照组相比,试验Ⅱ和Ⅲ组的料重比(A/G)显著降低(P<0.05),饲粮添加富含DHA微藻对福牛的体尺指标和屠宰性能无显著影响(P>0.05)。②与对照组相比,饲粮中添加微藻可显著提高血清SOD活性和T-AOC(P<0.05),显著降低MDA含量(P<0.05);试验Ⅲ组的GSH-Px活性显著提高(P<0.05)。综上,在本试验条件下,添加100 g/d富含DHA微藻可显著提高柴达木福牛的饲料转化率和血清抗氧化能力。

The purpose of this study was to investigate the effects of adding different levels of DHA-rich microalgae to the diet on the growth performance,body measurement index,slaughter performance,and serum antioxidant indices of Qaidamford cattle.A total of 24 healthy 24-month-old Qaidamford bulls were randomly assigned to three groups with 8 cattle per group.GroupⅠwas taken as a control group and fed with basal diets.GroupsⅡandⅢwere supplemented with 100 and 200 g/d DHA-rich microalgae powder in the basic diet,respectively.The pre-experimental period lasted for 10 days,and the experimental period lasted for 42 days.Growth performance,body size indicators,slaughter performance related indicators,and total antioxidant capacity(T-AOC),superoxide dismutase(SOD),glutathione peroxidase(GSH-Px)activities and malondialdehyde(MDA)content in serum were determined.The results showed that,①Compared with the control group,the average daily gain of groupⅡwas significantly higher(P<0.05),the feed-to-weight ratio were significantly lower of groupsⅡandⅢ(P<0.05).The body size and slaughter performance had no significantly change among three groups(P>0.05)②Serum T-AOC and SOD activitie were significantly increased(P<0.05),and the content of MDA(P<0.05)was significantly reduced by adding DHA-rich microalgae to the diet.The GSH-Px activity of groupⅢwas significantly higher than that of the control group(P<0.05).In conclusion,adding 100 g/d of DHA-rich microalgae to the diet significantly improved the feed conversion rate and serum antioxidant capacity of Qaidamford cattle under the experimental conditions.