This research work was conducted to evaluate the effect of dietary copper (Cu) levels on growth performance, feed utilization, and some hematological parameters of juvenile Siberian Sturgeon Acipenser baerii. Five semipurified diets containing 0, 3, 6, 12, and 24 mg Cu/kg in the form of copper sulfate pentahydrate (CuSO4·5H2O) were formulated to provide the actual dietary copper values of 1.8, 5.7, 10.1, 15.9, and 28.3 mg Cu/kg diet, respectively. The obtained results exhibited a significant improvement in the final weight, protein efficiency ratio, daily growth coefficient, and hepatosomatic index with increasing dietary copper levels up to 10.1 mg/kg diet, while the feed conversion ratio significantly decreased. Also, erythrocyte count, hemoglobin, and hematocrit values increased with increasing levels of dietary copper, but no steady trend was observed in mean corpuscular hemoglobin changes. Furthermore, the neutrophils were significantly increased with enhancing the copper level in the fish diet, while the lymphocytes declined. Findings of the current research illustrate that an appropriate dietary copper level is required for improvement of growth performance, oxygen transfer capability, and white blood cell proliferation. Based on the broken‐line regression analysis of leukocyte count and monocyte percentage, the optimum dietary copper supplementation was estimated to be 10.63 and 10.36 mg Cu/kg diet, respectively.

中文翻译：

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日粮无机铜对西伯利亚鲟Acipenser baerii幼鱼生长性能及部分血液学指标的影响

本研究工作旨在评估日粮铜 (Cu) 水平对西伯利亚鲟幼鱼的生长性能、饲料利用率和一些血液学参数的影响。配制了五水合硫酸铜 (CuSO4·5H2O) 形式的含 0、3、6、12 和 24 mg Cu/kg 的五种半纯化日粮，以提供 1.8、5.7、10.1、15.9 和 28.3 的实际日粮铜值分别为 mg Cu/kg 饮食。所得结果表明，随着日粮铜含量增加至 10.1 mg/kg 日粮，最终体重、蛋白质效率比、日生长系数和肝体指数有显着改善，而饲料转化率显着降低。此外，红细胞计数、血红蛋白和血细胞比容值随着膳食铜含量的增加而增加，但没有观察到平均红细胞血红蛋白变化的稳定趋势。此外，随着鱼饲料中铜含量的增加，中性粒细胞显着增加，而淋巴细胞则下降。目前的研究结果表明，为了提高生长性能、氧气转移能力和白细胞增殖，需要适当的膳食铜水平。根据白细胞计数和单核细胞百分比的折线回归分析，最佳膳食铜补充量估计分别为 10.63 和 10.36 mg Cu/kg 膳食。目前的研究结果表明，为了提高生长性能、氧气转移能力和白细胞增殖，需要适当的膳食铜水平。根据白细胞计数和单核细胞百分比的折线回归分析，最佳膳食铜补充量估计分别为 10.63 和 10.36 mg Cu/kg 膳食。目前的研究结果表明，为了提高生长性能、氧气转移能力和白细胞增殖，需要适当的膳食铜水平。根据白细胞计数和单核细胞百分比的折线回归分析，最佳膳食铜补充量估计分别为 10.63 和 10.36 mg Cu/kg 膳食。