酵母水解物对凡纳滨对虾生长性能、血清生化及免疫指标的影响OA

The experiment aimed to investigate the effects of different levels of yeast hydrolysate on the growth performance,serum biochemical indices,and non-specific immune function of Litopenaeus vannamei.A total of 700 healthy Litopenaeus vannamei of similar weight were randomly divided into four groups,with five replicates per group and 35 shrimps per replicate.The control group was fed with basal feed,while the experimental groups were supplemented with 0.5%,1.0%and 2.0%yeast hydrolysate in the basal feed.The pre-test period was two weeks,and the formal test period was eight weeks.The results showed that compared with the control group,the final weight and specific growth rate of Litopenaeus vannamei in the experimental groups were significantly increased(P<0.05).The weight gain rate,survival rate,and coefficient of condition in the 1.0%group were significantly increased(P<0.05),and the feed coefficient was significantly decreased(P<0.05).Compared with the control group,there were no significant differences in crude fat,crude ash,and moisture concentrations in the experimental groups of Litopenaeus vannamei(P>0.05),the crude protein content in the 1.0%group was significantly increased(P<0.05).The activities of alanine aminotransferase and aspartate aminotransferase in the serum of the 1.0%group were significantly decreased(P<0.05),and the total protein content was significantly increased(P<0.05).The albumin content in the experimental groups was significantly increased(P<0.05).The activities of lysozyme and acid phosphatase in the hepatopancreas of the 1.0%group were significantly increased(P<0.05),and the superoxide dismutase activity in the 1.0%and 2.0%groups was significantly increased(P<0.05).The study shows that yeast hydrolysate can improve the growth performance,body composition and overall health of Litopenaeus vannamei.Considering all factors,the appropriate addition amount of yeast hydrolysate in the feed of Litopenaeus vannamei is 1.0%.