Open AccessEffects of exogenous multienzyme complex supplementation in diets on growth performance, digestive enzyme activity and non‐specific immunity of the Japanese seabass, Lateolabrax japonicus
Author(s) -
Huang Zhangfan,
Li Zhongbao,
Xu Anle,
Zheng Dengjie,
Ye Youling,
Wang Zhen
Publication year - 2020
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12991
Subject(s) - biology , lateolabrax , superoxide dismutase , feed conversion ratio , alkaline phosphatase , lysozyme , lipase , amylase , digestive enzyme , xylanase , zoology , medicine , malondialdehyde , weight gain , endocrinology , enzyme , biochemistry , antioxidant , body weight , fishery , fish <actinopterygii>
This experiment aimed to investigate the effects of exogenous multienzyme complex (EC) on growth performance, digestive enzyme activity and non‐specific immunity of the Japanese seabass, Lateolabrax japonicus (initial weight 27.09 ± 0.08 g). EC includes protease, xylanase, glucanase and mannase. Japanese seabass were given six levels of EC (0, 0.5, 1.0, 1.5, 2.0 and 2.5 g/kg) for 28 days. Results show that EC significantly enhanced the weight gain rate and specific growth rate ( p < .05), while the feed conversion ratio reduced significantly ( p < .05). Activities of lipase and trypsin in liver and intestine significantly increased ( p < .05). Alkaline phosphatase, superoxide dismutase and lysozyme activities in serum and liver significantly increased ( p < .05), while the content of malondialdehyde in liver significantly declined ( p < .05). Regression analysis showed that the optimal supplementation of EC in WGR, SGR, FCR, SOD and LZM activity in serum was 1.66, 1.67, 1.81, 1.71 and 1.53 g/kg, respectively, while the best SOD, LZM activity in liver, trypsin activity in liver and intestine supplement were 1.64, 1.51, 1.81 and 1.97 g/kg. In conclusion, EC supplemented can improve the growth performance, digestive enzyme activity and non‐specific immunity of Japanese seabass, and it is recommended that the optimal supplementation of EC in diets of Japanese seabass is 1.5–2.0 g/kg.