The effect of different lysine levels on the growth performance and immune function of juvenile Cherax quadricarinatus
This experiment investigates the effects of adding different concentrations of lysine to feed on the growth performance and immune function of Cherax quadricarinatus.This experiment selected 900 healthy Cherax quadri-carinatus with an initial weight of(0.45±0.32)g as the experimental subjects,divided into 5 experimental groups(A-E),each with 3 replicates.Five types of formula feed with different amounts of lysine added:1.3％,1.6％,1.9％,2.2％,and 2.5％of equal nitrogen and equal energy were prepared for an 8-week feeding experi-ment.The experimental results showed that compared with other groups,Group D(2.2％)reached its maximum value.There were significant differences in final body weight,weight gain rate,and specific growth rate(P＜0.05).The gene expression levels of HEM,ALB,GLB in serum,AKP,ACP in liver and pancreas,and immune genes ALF,LZM,CHH,and SPI in group D reached their maximum values,with significant differences(P＜0.05);The activity of ALT and AST in serum and hepatopancreas in group D reached the minimum value,with significant differences(P＜0.05).In summary,this article recommends that the optimal amount of lysine added to Cherax quadricarinatus feed is 1.75％-2.05％.
lysineCherax quadricarinatusgrowth performanceimmune function
万方数据
维普
