Beneficial effects of dietary exogenous protease on the growth, intestinal health and immunity of GIFT (Oreochromis niloticus) fed plant-based diets
文献类型： 外文期刊
作者： Wu, Jian-Jun 1 ; Liu, Wei 3 ; Jiang, Ming 3 ; Zhou, Ying 2 ; Wang, Wei-Min 1 ; Wen, Hua 3 ; Liu, Hong 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Fisheries, Key Lab Freshwater Anim Breeding, Key Lab Agr Anim Genet Breeding & Reprod,Minist E, Wuhan, Peoples R China
2.Wuhan SunHY Biol Co Ltd, Wuhan, Peoples R China
3.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan, Peoples R China
关键词： disease resistance; growth; innate immunity; intestinal health; protease; tilapia
期刊名称：AQUACULTURE NUTRITION （ 影响因子：3.497； 五年影响因子：3.78 ）
ISSN： 1353-5773
年卷期： 2020 年 26 卷 5 期
页码：
收录情况： SCI
摘要： This study investigated the effects of dietary exogenous protease on the growth performance, intestinal health, immune parameters and disease resistance of genetically improved farmed tilapia (GIFT,Oreochromis niloticus). Five test diets with commercial protease at the levels of 0, 1.38, 2.76, 5.52 and 11.04 U/g (named PE0, PE1, PE2, PE5 and PE11, respectively) were administered to triplicate tanks with 30 fish for 60 days, and then, the fish were challenged withStreptococcus agalactiaefor 14 days. The results indicated that weight gain increased as exogenous protease increased from 0 to 5.52 U protease/g diet and then decreased significantly (p < .05) with a further increase in exogenous protease supplementation (p < .05). The height of the villi in the proximal intestine and distal intestine, the width of the villi in three segments of the intestine, and the thickness of the muscle layer in the proximal intestine and mid-intestine (p < .05) were increased in the fish fed the PE5 diet. Immune and antioxidant indices (except malondialdehyde), and survival after challenged withS. agalactiaewere higher in fish fed PE5 diets than in those fed other diets (p < .05). In conclusion, 5.52 U/g protease supplementation in a plant-based diet could promote the growth performance, intestinal physical barrier function, innate immunity andS. agalactiaeresistance of GIFT.
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