文献类型：期刊文献

英文题名：Effects of different levels of Yucca schidigera extract on the growth and nonspecific immunity of Pacific white shrimp (Litopenaeus vannamei) and on culture water quality

作者：Yang, Qi-hui[1];Tan, Bei-ping[1];Dong, Xiao-hui[1];Chi, Shu-yan[1];Liu, Hong-yu[1]

机构：[1]Guangdong Ocean Univ, Coll Fisheries, Lab Aquat Anim Nutr & Feed, Zhanjiang 524025, Guangdong, Peoples R China

年份：2015

卷号：439

起止页码：39

外文期刊名：AQUACULTURE

收录：SCI-EXPANDED(收录号：WOS:000349620900006)、、Scopus(收录号：2-s2.0-84922358440)、WOS

基金：This study was financially supported by the Special Fund for Agro-scientific Research in the Public Interest of China (201003020), the Guangdong University Innovation Talents Cultivating Project of China (1009324), the Guangdong Natural Science Foundation of China (S2012040007863), the Natural Science Foundation of Guangdong Ocean University (2010A020507001-29), the Industry Technology and Development Special Fund Project of Guangdong Province (2013B021100017), and the GDUPS (2011).

语种：英文

外文关键词：Litopenaeus vannamei; Yucca schidigera; Growth; Nonspecific immunity; Water quality

外文摘要：A total of 6000 shrimp (initial body weight of 0.82 +/- 0.02 g) were randomly distributed into twelve concrete pools (4.5 m x 3.5 m x 0.5 m) with 500 shrimp per pool and 3 pools per diet, respectively. Four kinds of isonitrogen and isoenergetic diets were formulated with 0, 0.1%, 0.2% and 0.3% Yucca schidigera extract (YSE), respectively. The experiment lasted 100 d. The results showed as follows: when supplemented with 0.2% dietary YSE, the shrimp weight gain rate significantly increased (p < 0.05), but no significant change was found in feed conversion ratio, specific growth rate, and survival rate (p > 0.05). Addition of 0.2% dietary YSE significantly increased the shrimp serum protein content, as well as the activities of acid phosphatase, alkaline phosphatase, nitric oxide synthase, glutamic-pyruvic transaminase, phenol oxidase, and hepatopancreas proteases (p < 0.05), but did not significantly affect the activities of total superoxide dismutases (T-SOD) and aspartate transaminase (p > 0.05). In the late culture period (5th week to 14th week) the total amount of ammonia-nitrogen, nitrite-nitrogen, nitrate-nitrogen, and reactive phosphorus in the culture water significantly decreased (p < 0.05). These results indicated that addition of 0.2% YSE in the diet was beneficial to the growth and nonspecific immunity of white shrimp and water quality. (C) 2014 Elsevier B.V. All rights reserved.