克氏原螯虾快速生长新品系F1生长性能与营养品质评价OA

This study established six treatment groups of Xuancheng(XC),Gaoyou(GY),Chongming(CM),Xuancheng×Gaoyou(XC×GY),Xuancheng×Chongming(XC×CM),and Gaoyou×Chongming(GY×CM)to breed a new fast-growing strain of Procambarus clarkii.The aim was to screen the group with the best growth performance and to evaluate its muscle nutritional quality,antioxidant capacity,and nonspecific im-mune function.The results showed that the XC group performed best in terms of final body weight,weight gain rate,and specific growth rate among the three inbred groups.The body weight of the XC×GY group in August was significantly higher than that of the other two hybrid groups,and its female shrimp exhibited the highest weight gain rate and specific growth rate.Therefore,the XC and XC×GY groups were selected for sub-sequent breeding.Fatty acid composition analysis indicated that the EPA and DHA content in the XC group was significantly higher than that in the XC×GY group,indicating higher nutritional value.Amino acid analysis revealed that both groups had abundant essential amino acids,with the XC group having the highest amino acid score and thus higher nutritional value.However,the content of flavour-free amino acids in the muscle of the XC×GY group was significantly higher than that in the Xuancheng group,suggesting a potentially more deli-cious taste.The catalase activity in the Xuancheng group was significantly higher than that in the control group,indicating stronger antioxidant capacity.In summary,the XC and XC×GY groups demonstrated superior growth performance,with both groups exhibiting high nutritional value in terms of fatty acid and amino acid composition.The former had a higher amino acid score,while the latter was rich in flavour-free amino acids.This study provides a scientific basis for breeding a new,fast-growing strain of P.clarkii.