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Dietary calcium requirement of red swamp crayfish (Procambarus clarkia)
Aquaculture Nutrition ( IF 3.5 ) Pub Date : 2020-10-08 , DOI: 10.1111/anu.13173
Lei Xu 1, 2 , Juan Tian 2 , Hua Wen 2 , Fan Wu 2 , Wenbing Zhang 1 , Weihua Gao 1 , Xiaoru Chen 3
Affiliation  

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.

中文翻译:

红色沼泽小龙虾(Procambarus clarkia)的膳食钙需求量

为了研究红沼泽小龙虾(Procambarus clarkia)的饮食钙需求,制定了六种半精制饮食,分别包含不同浓度的钙(2.7(对照组),6.1、11.9、17.6、23.5和29.1 g / kg钙)。每种饮食均人工喂养15头小龙虾,一式三份,平均初始体重(6.22±0.87)g,持续8周。结果表明,增重率(WGR)从11.9 g / kg组显着增加,饲料转化率(FCR)从21.9 g / kg组显着下降(p  <.05)。随着饮食中钙水平的升高,肠道和肝胰腺中的蛋白酶活性以及血清中甲状旁腺激素的浓度显着降低(p <.05),而外骨骼中的钙和磷含量,肌肉中的钙含量和血清中的降钙素浓度显着增加(p  <.05)。随着饮食中钙含量增加至11.9–17.6 g / kg,肠道和肝胰腺中的脂肪酶和淀粉酶活性,血清碱性磷酸酶和总维生素D浓度显着增加(p  <.05)。29.1 g / kg组的无机磷含量显着低于其他组(p  <.05)。基于WGR的折线模型分析和基于FCR的二次曲线模型分析显示,红色沼泽小龙虾的最佳膳食钙需求量为12.7至17.1 g / kg。
更新日期:2020-10-08
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