Xiao J F, Wu S G, Zhang H J, Yue H Y, Wang J, Ji F, Qi G H
Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, P. R. China.
Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, P. R. China
Poult Sci. 2015 Aug;94(8):1871-8. doi: 10.3382/ps/pev138. Epub 2015 Jun 5.
This study was aimed at investigating the bioefficacy of organic compared with inorganic manganese (Mn) for eggshell quality. An amino acid-Mn complex or Mn sulfate monohydrate was used as the organic or inorganic Mn source. A total of six hundred forty-eight 50-wk-old layers (Hy-Line Brown) were divided into 9 groups; each group consisted of 6 replicates with 12 layers each. The feeding trial lasted 12 wk. During the first 4 wk of the feeding trial, the groups were fed a basal diet, which met the nutrient requirements of the layers, except for Mn. During the following 8 wk, 9 levels of Mn (inorganic Mn: 0, 25, 50, 100, and 200 mg/kg; organic Mn: 25, 50, 100, and 200 mg/kg) were used to supplement, respectively, in the basal diet on an equimolar basis. An exponential regression model was applied to calculate the bioefficacy of organic Mn compared with the inorganic Mn. Dietary supplementation with either organic or inorganic Mn did not influence egg production and feed efficiency of (P > 0.05), and eggshell quality did not exhibit a significant response to dietary supplementation with Mn sources at 56 and 58 wk (P > 0.05). Dietary supplementation with either organic Mn or inorganic Mn significantly enhanced the thickness, breaking strength, and elastic modulus of the eggshells compared with the control group at the end of 62 wk (P < 0.05). At the end of 62 wk, the bioefficacy of organic Mn was 357% (shell thickness), 406% (breaking strength), 458% (elastic modulus), and 470% (eggshell Mn), as efficacious as inorganic Mn at equimolar levels. This study suggests that organic Mn enhances eggshell quality in aged laying hens compared with inorganic Mn.
本研究旨在调查有机锰与无机锰对蛋壳质量的生物有效性。使用氨基酸锰络合物或一水硫酸锰作为有机或无机锰源。总共648只50周龄的蛋鸡（海兰褐）被分为9组；每组由6个重复组成，每个重复有12只蛋鸡。饲养试验持续12周。在饲养试验的前4周，给各组蛋鸡饲喂基础日粮，该日粮满足蛋鸡的营养需求，但不含锰。在接下来的8周内，分别以等摩尔的量在基础日粮中添加9种水平的锰（无机锰：0、25、50、100和200毫克/千克；有机锰：25、50、100和200毫克/千克）。应用指数回归模型计算有机锰与无机锰相比的生物有效性。日粮中添加有机或无机锰均不影响产蛋量和饲料效率（P>0.05），并且在56周和58周时，蛋壳质量对日粮中添加锰源未表现出显著反应（P>0.05）。与对照组相比，在62周龄时，日粮中添加有机锰或无机锰均显著提高了蛋壳的厚度、抗压强度和弹性模量（P<0.05）。在62周龄时，有机锰的生物有效性分别为357%（蛋壳厚度）、406%（抗压强度）、458%（弹性模量）和470%（蛋壳锰含量），在等摩尔水平下与无机锰的效果相同。本研究表明，与无机锰相比，有机锰可提高老龄蛋鸡的蛋壳质量。
