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Effects of Yeast Autolysate in the Practical Diet on the Growth Performance, Immune Response, and Disease Resistance of Pacific White Shrimp
Author(s) -
Ma Shuoli,
Wang Xiaoxia,
Gao Weihua,
Xu Weiqi,
Zhang Wenbing,
Mai Kangsen
Publication year - 2020
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1002/aah.10095
Subject(s) - litopenaeus , shrimp , biology , vibrio parahaemolyticus , feed conversion ratio , lysozyme , fish meal , zoology , meal , weight gain , respiratory burst , food science , body weight , fishery , endocrinology , fish <actinopterygii> , biochemistry , bacteria , genetics
The present study was conducted to investigate the effects of supplementing the practical diet with yeast autolysate ( YA ) on the growth performance, immunity, and disease resistance of Pacific white shrimp Litopenaeus vannamei . Four isonitrogenous and isolipidic practical diets were formulated. The relatively high‐fish‐meal control diet contained 25% fish meal without YA supplementation (E1). The other control diet contained 20% fish meal without YA (E2). With the E2 diet as the basis, two additional experimental diets were created by further supplementation with 1% YA (E3) and 2% YA (E4). The shrimp (initial weight: 0.30 ± 0.02 g) were fed with the four experimental diets for 8 weeks and then challenged with Vibrio parahaemolyticus . The results indicated that there were no significant differences in survival rate ( SR ) or feed intake ( FI ) among these groups. The weight gain rate ( WGR ) of group E1 was not significantly different from that of groups E3 and E4. The feed conversion ratio ( FCR ) in group E4 was lower than that of group E2, and group E4 had the highest protein efficiency ratio ( PER ). The total hemocyte counts ( THC ) and lysozyme activities in group E3 and group E4 were significantly higher than those of the other groups. Group E3 had the highest respiratory burst ( RB ). After V. parahaemolyticus administration, group E3 and group E4 had significantly lower cumulative mortalities than group E1 did. In conclusion, the 20% fish meal diet without YA supplementation (E2) yielded a significantly lower growth rate than the 25% fish meal diet without YA supplementation (E1) did. Furthermore, the Pacific white shrimp that received dietary supplementation with 1% YA demonstrated improved growth rate, immune response, and resistance to the V. parahaemolyticus challenge compared with those that were fed the 20% fish meal diet without YA supplementation (E2).