文献类型： 外文期刊
作者： Xu, Lei 1 ; Tian, Juan 2 ; Wen, Hua 2 ; Wu, Fan 2 ; Zhang, Wenbing 1 ; Gao, Weihua 1 ; Chen, Xiaoru 3 ;
作者机构： 1.Yangtze Univ, Coll Anim Sci, Jingzhou 434024, Peoples R China
2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan, Peoples R China
3.Tongwei Co Ltd, Hlth Aquaculture Key Lab Sichuan Prov, Chengdu 610039, Peoples R China
关键词： calcium; growth; Procambarus clarkia; serum biochemical indices
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：
页码：
收录情况： SCI
摘要： To investigate dietary calcium requirement of red swamp crayfish (Procambarus clarkia), six semi-purified diets were formulated to contain different concentrations of calcium (2.7(control group), 6.1, 11.9, 17.6, 23.5 and 29.1 g/kg calcium). Each diet was hand-fed to triplicate of 15 crayfish with average initial body weight (6.22 +/- 0.87) g for 8 weeks. The results showed that weight gain rate (WGR) significantly increased and feed conversion ratio (FCR) significantly decreased from 11.9 to 23.5 g/kg groups (p < .05). Protease activities in intestine and hepatopancreas and parathyroid hormone concentrations in serum significantly decreased with increasing dietary calcium levels (p < .05), while calcium and phosphorus contents in exoskeleton, calcium content in muscle and calcitonin concentrations in serum significantly increased (p < .05). The activities of lipase and amylase in intestine and hepatopancreas, serum alkaline phosphatase and total vitamin D concentrations in serum had significant increase as dietary calcium content increased up to 11.9-17.6 g/kg (p < .05). The inorganic phosphorus content in 29.1 g/kg group was significantly lower than those in other groups (p < .05). Broken-line model analysis based on WGR and quadratic curve model analysis based on FCR showed that optimal dietary calcium requirement of red swamp crayfish ranged from 12.7 to 17.1 g/kg.
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