China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (10): 3635-3643.doi: 10.16431/j.cnki.1671-7236.2021.10.014

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effects of Sophora subprosrate Polysaccharide on Growth Performance and Immune Function of Oreochromis niloticus

ZHAO Yi1, WEN Luting1,2, HUANG Yin2, CHEN Zhong2, LIU Qian1, LIN Yong2, HU Tingjun1   

  1. 1. College of Animal Science and Technology, Guangxi University, Nanning 530005, China;
    2. Guangxi Academy of Fishery Science, Nanning 530021, China
  • Received:2021-03-04 Online:2021-10-20 Published:2021-09-30

Abstract: This experiment was designed to investigate the effects of different doses of Sophora subprosrate polysaccharide (SSP) on the growth and immune function of Oreochromis niloticus. In the test, 400 tails of Oreochromis niloticus were randomly divided into 5 groups with 4 replicates per group and 20 Oreochromis niloticus per replicate. The animals were fed the basal diet supplemented with 0 (CK group), 1.0 (SSP 1 group), 2.0 (SSP 2 group), 4.0 g/kg (SSP 3 group) SSP and 20 mg/(kg·BW·d)(APS group), respectively. The experiment period was 30 d. At the end of the experiment, Astragalus polysaccharide the growth indices, such as weight gain rate (WGR), specific growth rate (SGR)and feed conversion ratio (FCR), blood physiological and biochemical indexes, serum and liver nonspecific immunity indexes of Oreochromis niloticus were determined. The results showed that compared with CK group, there were no significant changes in WGR, SGR and FCR in SSP 1 and SSP 2 groups (P>0.05). The levels of cholesterol (TC) and total protein (TP) in serum were significantly decreased (P<0.05), the organ indices of liver and spleen of Oreochromis niloticus in experimental groups (SSP 1, SSP 2, SSP 3 and APS groups) were no significent changes (P>0.05), IL-12 level was significantly increased (P<0.05). The levels of IL-2 were increased (P<0.05) and the levels of IFN-γ were decreased (P<0.05) in SSP 2 and SSP 3 groups. The activities of POD and GSH-Px of Oreochromis niloticus in SSP 1 and SSP 2 group were significantly higher than those in the CK group (P<0.01). In brief, SSP could promote the growth, antioxidant capacity and immune function of Oreochromis niloticus, and the optimal supplemental level of SSP was 2.0 g/kg.

Key words: Sophora subprosrate polysaccharide (SSP); Oreochromis niloticus; growth performance; immune function

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