Journal
FISHERIES SCIENCE
Volume 87, Issue 4, Pages 559-567Publisher
SPRINGER JAPAN KK
DOI: 10.1007/s12562-021-01508-7
Keywords
Lateolabrax japonicas; Alfalfa powder; Growth performance; Nonspecific immunity; Digestive enzyme activity
Categories
Funding
- Natural Science Fund Project in Fujian, China [2017J01638]
- Science and Technology Planning Project in Fujian, China [2015N0010, 2017S0053]
- Science and Technology Project in Xiamen, China [3502Z20143017]
- Open Research Fund Program of Fujian Provincial Key Laboratory of Marine Fishery Resources and Eco-environment [fjmfre2019001]
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Feeding Lateolabrax japonicus with different levels of dietary alfalfa powder showed effects on growth performance, nonspecific immunity, and digestive enzyme activity. The study found that the feed conversion ratio was lowest at 20 g/kg diet, with increased serum total soluble protein content, lysozyme and total superoxide dismutase activity first increased then remained stable, while alkaline phosphatase sharply increased at higher levels of alfalfa powder.
Six graded levels of dietary alfalfa Medicago falcata L. powder (0, 5, 10, 15, 20 and 25 g/kg diet, respectively) were fed to Lateolabrax japonicus (initial body weight: 11.41 +/- 0.06 g; initial body length: 10.33 +/- 0.12 cm) in triplicate groups for 4 weeks in a flow-through system to investigate the effects of alfalfa powder on the growth performance, nonspecific immunity and digestive enzyme activity. The results showed that alfalfa powder reduced the feed conversion ratio (FCR), with the lowest value obtained at 20 g/kg diet among all groups (p < 0.05). The serum total soluble protein (TP) content, activity of lysozyme (LZM) and total superoxide dismutase (T-SOD) were increased first then remained more or less stable; the alkaline phosphatase (AKP) was maintained stable first then sharply increased with the increasing dietary alfalfa powder levels. The trypsin and lipase (LPS) activity of fish was significantly increased at 20 g/kg diet, compared to the control group (p < 0.05). Regression analyses of FCR, TP, LZM, T-SOD, LPS and trypsin indicated that the optimal supplement amount was 17.75-21.48 g/kg diet. Combined with the significant difference analyses obtained from the current study, we suggest the additional amount of alfalfa should be about 20 g/kg diet.
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