Effect of castor meal on growth performance of Hermetia illucens larvae
The experiment aimed to investigate the impact of replacing soybean meal with castor meal as a feed on the growth and development,as well as the influence on intestinal microorganisms of Hermetia illucens larvae.The Hermetia illucens larvae were divided into three groups:Soybean meal group(SM group),50％soybean meal and 50％castor meal group(SCM group),and castor meal group(CM group),with three replicates for each group.Parameters such as larval survival,body weight,and body length were measured,and changes in crude protein and crude fat content in larvae and larval frass,as well as the intestinal bacterial community of larvae,were analyzed.The experiment lasted for 12 days.The results showed that the crude protein and crude fat content in the larval frass of the CM group were significantly lower than those in the other two groups(P＜0.05).16S rRNA gene sequencing revealed that castor meal had no significant impact on the major types,abundance,and diversity of intestinal bacteria in the larvae(P＞0.05).The Hermetia illucens larvae in the CM group exhibited faster growth,with significantly higher crude protein and crude fat content compared to the SM group(P＜0.05),while the mortality rate showed no significant difference(P＞0.05).The study suggests that replacing soybean meal with castor meal as a feed is more beneficial for the growth of Hermetia illucens larvae.
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