硒源及硒水平对杂交鲌"先锋1号"生长性能和肌肉品质的影响OA

To investigate the effects of sodium selenite and selenium yeast supplementation on growth performance and muscle quality of juvenile hybrid culter"Xianfeng No.1"(Erythroculter ilishaeformis×Ancherythroculter nigro-cauda),a basal diet(C0)was supplemented with 0.3,0.6,and 1.2 mg/kg selenium from sodium selenite(groups S1,S2,S3)or selenium yeast(groups Y1,Y2,Y3).A total of 420 juvenile hybrid F1[initial body weight:(59.62±0.53)g]were randomly allocated into seven groups(three replicates per group)and fed experimental diets for 8 weeks.The results showed that the sodium selenite group S3(1.2 mg/kg)and selenium yeast group Y2(0.6 mg/kg)achieved the highest weight gain rate(WGR)and specific growth rate(SGR).Y2 exhibited significantly higher final body weight,WGR,and SGR compared to the control(C0)and S2 groups(P<0.05).Selenium yeast significantly enhanced muscle sele-nium deposition(P<0.05),with Y2 showing the highest crude protein content(20.00%).Neither selenium source affected crude fat content(P>0.05).Muscle elasticity,cohesiveness,and resilience increased with selenium levels(P<0.05).Selenium yeast groups demonstrated superior hardness,adhesiveness,and gumminess(P<0.05),while Y2 and Y3 exhibited higher chewiness than sodium selenite groups(P<0.05).Serum aspartate aminotransferase(AST)in S3 and Y2,and alkaline phosphatase(ALP)in Y2 were significantly lower than that in C0(P<0.05).Total cholesterol(T-CHO)decreased in S3,Y1,Y2,and Y3 compared to C0(P<0.05).No significant differences in muscle amino acids were observed between selenium sources,though Y2 showed a higher EAA/TAA than C0,S2,and Y3(P<0.05).Y2 exhibited significantly elevated n-3 PUFA content(P<0.05),while Y1 exhibited higher n-6 PUFA levels(P<0.05).In conclusion,under the experimental conditions of this study,with growth performance and muscle quality as evaluation criteria,it is recommended to add 0.6 mg/kg selenium yeast to the feed of hybrid F1 feed.