Dietary fish oil replacement by soybean oil: Effect on plasma vitellogenin, sex steroids and ovarian steroidogenesis in Chinese strip-necked turtles (Mauremys sinensis)

文献类型： 外文期刊

第一作者： Hong, Meiling

作者： Hong, Meiling;Sheng, Cheng;Li, Na;Li, Weihao;Ding, Li;Shi, Haitao;Wang, Dongmei;Shi, Haitao

作者机构：

关键词： Chinese strip-necked turtle; fish oil; soybean oil; steroidogenesis; vitellogenin

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN： 1355-557X

年卷期： 2018 年 49 卷 9 期

页码：

收录情况： SCI

摘要： In order to investigate the effects of dietary fish oil replacement, the turtles (Mauremys sinensis) were fed four experimental diets for 10months: FO (100% fish oil), FSO (70% fish oil and 30% soybean oil), SFO (30% fish oil and 70% soybean oil) and SO (100% soybean oil), sampled at pre-vitellogenesis, vitellogenesis and post-vitellogenesis. The results showed that plasma gonadotropin-releasing hormone (GnRH) levels were the highest at pre-vitellogenesis, which promoted the secretion of gonadotropin and sex steroids. Therefore, plasma luteinizing hormone (LH) and estrogen (E-2) levels were significantly increased at post-vitellogenesis (p<0.05), while follicle-stimulating hormone (FSH) levels increased at vitellogenesis (p<0.05). The FO and FSO groups had significantly higher GnRH and E-2 levels than the other two groups (p<0.05). In addition, plasma vitellogenin (Vtg) levels significantly increased at vitellogenesis and post-vitellogenesis (p<0.05), which were significantly higher in the groups of FO and FSO than SO (p<0.05). Moreover, the expression levels of hepatic estrogen receptor (Er) mRNA were significantly increased at vitellogenesis and post-vitellogenesis while ovarian Cyp191 mRNA were significantly increased at post-vitellogenesis (p<0.05), and both were the lowest in SO. Taken together, the replacement of fish oil with 66.7% soybean oil is feasible.

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