Effects of Increasing Supplementation of Magnesium in Diets on Productive Performance and Eggshell Quality of Aged Laying Hens
Effects of Increasing Supplementation of Magnesium in Diets on Productive Performance and Eggshell Quality of Aged Laying Hens
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DOI：
10.1007/s12011-012-9537-z
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发表时间：
2013-01-01
影响因子：
3.9
通讯作者：
Kil, Dong Yong
中科院分区：
文献类型：
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作者：
Kim, Chan Ho;Paik, In Kee;Kil, Dong Yong
日粮中镁（Mg）浓度与产蛋鸡的生产性能和蛋壳质量有关，但结果尚不确定。本试验研究了日粮中添加不同浓度镁对蛋鸡生产性能和蛋壳品质的影响。选用640只72周龄海兰褐蛋鸡，随机分为4个日粮处理，每个处理4个重复。制备含有1.6g/kg Mg的商业型基础饮食，并通过向基础饮食中添加1.0、1.5或2.0g MgO制备三种另外的饮食，以在饮食中含有2.3、2.6或3.0g/kg Mg。母鸡自由采食饲料5周。结果表明，蛋壳中镁含量随日粮镁浓度的增加而增加（线性，P < 0.01）。提高日粮镁水平可显著降低破蛋率和无壳蛋率（线性和二次曲线，P < 0.01），但可显著提高蛋壳强度（线性，P < 0.05）。日粮中镁浓度的增加使采食量呈线性下降（P < 0.05），但对产蛋量、蛋重、饲料转化率和哈氏单位无明显影响。蛋壳的Hunter L* 和a* 值随日粮镁浓度的增加而降低（线性，P < 0.05）。总之，用含镁浓度增加至3.0 g/kg的日粮饲喂老年产蛋鸡可提高蛋壳强度，但对产蛋性能无不利影响。
Magnesium (Mg) concentrations in diets have been associated with performance and eggshell quality of laying hens, but the results have been inconclusive. In this experiment, the effects of increasing concentrations of dietary Mg on productive performance and eggshell quality of aged laying hens were evaluated. A total of 640 Hy-Line Brown laying hens of 72 weeks of age were randomly allotted to one of four dietary treatments with four replicates per treatment. A commercial-type basal diet containing 1.6 g/kg Mg was prepared, and three additional diets were prepared to contain 2.3, 2.6, or 3.0 g/kg Mg in diets by adding 1.0, 1.5, or 2.0 g of MgO to the basal diet. The diets were fed to hens ad libitum for 5 weeks. Results indicated that Mg concentrations in eggshells were increased (linear, P < 0.01) with increasing concentrations of Mg in diets. Increasing concentrations of Mg in diets decreased (linear and quadratic, P < 0.01) broken and shell-less egg production, but improved (linear, P < 0.05) eggshell strength. Feed intake was decreased (linear, P < 0.05) with the concentrations of Mg in diets, but hen-day egg production, egg weight, feed conversion ratio, and Haugh unit were not affected by increasing concentrations of Mg in diets. Hunter L* and a* values of eggshell were decreased (linear, P < 0.05) as the concentrations of Mg in diets increased. In conclusion, feeding aged laying hens with diets containing increasing concentrations of Mg up to 3.0 g/kg improves eggshell strength, but has no detrimental effects on laying performance.