Interactive effects of temperature-dietary protein level on somatotropic gene expression and its interrelationship with growth in juvenile GIFT tilapia Oreochromis niloticus
文献类型: 外文期刊
作者: Qiang, Jun 1 ; Yang, Hong 2 ; Wang, Hui 3 ; Kpundeh, Mathew Didlyn 1 ; Xu, Pao 1 ;
作者机构: 1.Nanjing Agr Univ, Wuxi Fisheries Coll, Wuxi 214081, Peoples R China
2.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Freshwater Fisheries & Germplasm Resource, Minist Agr, Wuxi 214081, Jiangsu, Peoples R China
3.Guangdong Ocean Univ, Coll Fisheries, Zhanjiang 524025, Peoples R China
关键词: Oreochromis niloticus;Temperature;Dietary protein level;Pituitary growth hormone;Hepatic growth hormone receptor;Insulin-like growth factor-I
期刊名称:AQUACULTURE ( 影响因子:4.242; 五年影响因子:4.723 )
ISSN:
年卷期:
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收录情况: SCI
摘要: Water temperature and dietary protein play an important role in influencing the expression of somatotropic gene. Based on central composite rotatable experimental design and response surface method, the interacting effects of temperature (20–34 °C) and dietary protein level (25–50%) on expression of somatotropic gene and its interrelationship with specific growth rates (SGR) and feed efficiency (FE) of juvenile GIFT tilapia were studied under laboratory conditions. Results showed that the linear, quadratic and interacting effects of temperature and dietary protein on both pituitary growth hormone (GH) and hepatic growth hormone receptor 1 (GHR1) mRNA levels were statistically significant (P < 0.05). The linear and interacting effects of temperature and dietary protein on hepatic insulin-like growth factor I (IGF-I) mRNA levels were highly significant (P < 0.01); but the quadratic effect of temperature was nonsignificant (P > 0.05). The regression equations of pituitary GH, hepatic GHR1 and IGF-I mRNA towards the two factors of interest were established, with the coefficients of determination being 0.958, 0.938 and 0.978, respectively (P < 0.01). Pituitary GH, hepatic GHR1 and IGF-I showed positive relationships with SGR and FE. These results suggest that the expression of somatotropic gene be affected by different combination of temperature and dietary protein level as they regulate growth and FE.
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