| 摘要: |
| [目的]探讨肉仔鸡对不同镁源的生物学利用率。[方法] 将360只1日龄的AA肉仔鸡随机分为10个处理组,每处理组6个重复,每重复6只公雏,分别饲喂添加氧化镁(MgO)、天门冬氨酸镁(MgAsp)和天门冬氨酸螯合镁(MgdiAsp)的日粮(各种镁源添加量均设0。9,1。8和2。7 g/kg 3个添加水平),以不加镁的处理组为对照。21日龄时测定肉仔鸡组织镁和肝脏丙二醛(MDA)含量及肝脏过氧化氢酶(CAT)活性,以组织镁、肝脏MDA含量和CAT活性为指标,评价肉仔鸡对不同镁源的生物学利用率。[结果] 肉仔鸡血清镁含量随MgO、MgAsp和MgdiAsp添加量的增大而线性提高(P<0。01)；肝脏镁含量随日粮中MgO(P<0。01)、MgAsp(P<0。05)添加量的增加呈二次曲线性提高；肉仔鸡肝脏CAT活性随MgAsp (P<0。05)或 MgdiAsp(P<0。01) 添加量的增加线性提高,随MgO添加量的增加呈二次曲线性提高(P<0。05)；肉仔鸡肝脏MDA含量随日粮镁添加量的增加而线性降低(P<0。05)。以MgO的生物学利用率为100%,以血清镁含量、肝脏CAT活性、MDA含量为衡量指标时, MgAsp的相对生物学利用率分别为155%,283%和150%,MgdiAsp的相对生物学利用率分别为203%,424%和133%。[结论] 日粮中添加镁可以改善肉仔鸡的镁营养状态,提高肉仔鸡肝脏CAT的活性,降低脂质过氧化水平,且有机镁的添加效果优于无机镁。 |
| 关键词: 肉仔鸡 镁 生物学利用率 组织镁含量 过氧化氢酶活性 丙二醛含量 |
| DOI： |
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| 基金项目:国家自然科学基金项目（30371043） |
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| Evaluation of relative bioavailabities of different magnesium sources in broilers |
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| Abstract: |
| 【Objective】 The experiment was conducted to study the relative bioavailabities of magnesium sources for broilers. 【Method】 Three hundred and sixty 1-day-old male AA broiler chicks were allocated to ten treatments,each with six replicates of 6 chickens.Birds were fed diets supplemented with MgO,MgAsp or MgdiAsp (magnesium (Mg) level from each Mg source at 0.9,1.8,2.7 g/kg of the diet respectively,and the basal diet served as the control.Mg concentrations in liver and serum,hepatic catalase activity and MDA content of broiler chickens at 21d were determined as criteria for relative biovailability assays of Mg.【Result】 Serum Mg concentration increased linearly as MgO,MgAsp or MgdiAsp supplementation increased (P<0.01).Hepatic Mg concentration increased quadratically as MgO or MgAsp supplementation increased (P<0.01).Hepatic catalase (CAT) activity increased linearly in birds fed with MgAsp or MgdiAsp (P<0.01) and quadratically in birds fed with MgO (P<0.05) as dietary Mg supplementation level increased. Hepatic MDA content decreased linearly as dietary Mg supplementation level increased (P<0.05).The respective relative biovailability values compared with 100% from MgO were 155%,283%,150% for MgAsp;203%,424%,133% for MgdiAsp. 【Conclusion】 Dietary Mg supplementation could improve magnesium nutrition status of broiler chicken;and organic magnesium such as MgAsp or MgdiAsp is more effective to improve hepatic CAT activity and decrease MDA content. |
| Key words: chickens magnesium bioavailability tissue magnesium catalase activity malondialdehyde content |
