| 摘要: |
| 【目的】研究不同钴源对草鱼幼鱼生长性能、组织钴含量及部分血清指标的影响，筛选草鱼饲料中适宜的钴源。【方法】选取初始体质量为(8.63±1.14) g的草鱼幼鱼，随机分成4组，每组设置3个重复，每个重复40尾，分别饲喂添加氯化钴、碳酸钴、乙酸钴和氧化钴4种钴源(钴的添加量为0.20 mg/kg）的试验日粮，养殖70 d后，测定草鱼的生长性能、不同组织钴含量及部分血清指标。【结果】氯化钴组草鱼的特定生长率和体质量增加率显著高于氧化钴组和乙酸钴组，饲料系数显著低于氧化钴组和乙酸钴组，蛋白质效率显著高于乙酸钴组P＜0.05)，不同钴源对草鱼的成活率无显著影响(P＞0.05)；氯化钴组草鱼的肝脏、肾脏和肌肉钴含量均最小，显著低于氧化钴组(P＜0.05)，不同钴源组间草鱼肠道钴含量无显著差异(P＞0.05)；血清VB12和叶酸浓度均以氯化钴组最高，碳酸钴组稍低，氧化钴和乙酸钴组显著下降(P＜0.05)，4个钴源组血清总蛋白质量浓度和葡萄糖浓度均未表现出显著差异(P＞0.05)。【结论】氯化钴对草鱼生长性能、组织钴含量及血清指标的影响效果最为明显，其次为碳酸钴，两者均优于乙酸钴和氧化钴。 |
| 关键词: 草鱼 钴 生长性能 组织钴含量 血清指标 |
| DOI： |
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| 基金项目:国家公益性行业（农业）科研专项（201003020） |
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| Influence of cobalt sources on growth performance,Co concentration in tissues and serum parameters in juvenile grass carp (Ctenopharyngodon idellus) |
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| Abstract: |
| 【Objective】This experiment aimed at studying the effects of different Co sources on growth performance,Co concentration in tissues and serum parameters in juvenile grass carp (Ctenopharyngodon idellus),to screen the appropriate Co sources in the diet for grass carp.【Method】Co chloride,Co carbonate,Co acetate or Co oxide were added to the basal diet at the level of 0.20 mg/kg.Each experiment diet was randomly assigned to triplicate (N=40 fish/replicate) with initial body weights of (8.63±1.14) g for 70 days.【Result】The juvenile grass carps fed with diets supplemented with Co chloride had significantly increase in weight gain rate (WGR),specific growth rate (SGR) and protein efficiency ratio (PER),and had significantly decrease in feed conversion rate (FCR) compared to the groups fed with diets supplemented with Co acetate or Co oxide (P＜0.05).There was no significant difference in survival rate among groups (P＞0.05).When the juveniles were fed with diet supplemented with Co chloride,Co concentrations in liver,kidney and muscle were lower than the juveniles fed with diets supplemented with Co oxide (P＜0.05).There was no significant difference in intestine Co concentration among groups (P＞0.05).The concentration of serum Vitamin B12(VB12) was equivalent between Co chloride and Co carbonate groups, whereas in Co chloride group it was significantly higher than in Co acetate or Co oxide groups (P＜0.05).The tendency of serum folic acid content was similar as serum content in these groups (P＜0.05).However,serum concentrations of glucose and total protein could not be used to assess Co status (P＞0.05).【Conclusion】Co chloride is more available than other three Co sources based on growth performance,Co concentration in tissues and serum parameters in juvenile grass carp. |
| Key words: Ctenopharyngodon idellus cobalt growth performance Co concentration in tissues serum parameters |
