Bakhshalinejad R, Hassanabadi A, Nassiri-Moghaddam H, Zarghi H
Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.
J Anim Physiol Anim Nutr (Berl). 2018 Jun;102(3):746-754. doi: 10.1111/jpn.12873. Epub 2018 Jan 25.
The aim of this study was to examine the effects of various levels of supplemental calcium iodate (CI) on productive performance, egg quality, blood indices and iodine (I) accumulation in the eggs in commercial laying hens. A total of 240 White Leghorn layers (Hy-line W36) were divided through a completely randomized design into six treatments with five replicates and eight hens per each at 32 weeks of age. This experiment lasted for 12 weeks. Concentrations of I in the mash diets were 0.74, 3.13, 5.57, 8.11, 10.65 and 12.94 mg I/kg of feed in treatments 1-6 respectively. The added doses of CI were included 0.0 (control), 2.5, 5.0, 7.5, 10.0 and 12.5 mg/kg of diet for treatments 1-6 respectively. There were no significant differences in productive performance among the treatments. The highest eggshell strength was observed in group fed diet containing 3.13 mg I/kg (p = .014). The highest percentage of calcium and lowest percentage of phosphorus in eggshell were observed in group fed diet containing 12.94 mg I/kg (p = .0001). Feeding hens with diet containing 12.94 mg I/kg increased serum triiodothyronine-to-thyroxine ratio (p = .0001). Serum alanine aminotransferase activity in hens fed diet containing 12.94 mg I/kg was significantly more than control (p = .041). Blood Serum triglycerides in hens fed diet containing 8.11 mg I/kg were significantly higher than control (p = .0001). Edible fraction of the eggs of birds fed diet containing 12.94 mg I/kg was enriched by I almost 3 times more than those fed diet containing 0.74 mg I/kg. The results suggested that egg production, egg mass, feed intake and feed conversion ratio were not significantly affected by dietary I levels. Iodine accumulation in the eggs were increased by increasing dietary I levels and the level of 10 mg/kg CI could supply I enrichment of the eggs.
本研究旨在探讨不同水平的碘酸钙（CI）对商品蛋鸡生产性能、蛋品质、血液指标及蛋中碘（I）积累的影响。选取240只海兰W36白来航蛋鸡，在32周龄时通过完全随机设计分为6个处理组，每组5个重复，每个重复8只鸡。本试验持续12周。处理1 - 6组配合饲料中碘的浓度分别为0.74、3.13、5.57、8.11、10.65和12.94 mg I/kg饲料。CI的添加剂量分别为处理1 - 6组0.0（对照）、2.5、5.0、7.5、10.0和12.5 mg/kg日粮。各处理组生产性能无显著差异。在饲喂含3.13 mg I/kg日粮的组中观察到最高蛋壳强度（p = 0.014）。在饲喂含12.94 mg I/kg日粮的组中观察到蛋壳中钙的百分比最高，磷的百分比最低（p = 0.0001）。给母鸡饲喂含12.94 mg I/kg日粮可提高血清三碘甲状腺原氨酸与甲状腺素比值（p = 0.0001）。饲喂含12.94 mg I/kg日粮的母鸡血清丙氨酸氨基转移酶活性显著高于对照组（p = 0.041）。饲喂含8.11 mg I/kg日粮的母鸡血清甘油三酯显著高于对照组（p = 0.0001）。饲喂含12.94 mg I/kg日粮的鸡所产蛋的可食部分碘含量比饲喂含0.74 mg I/kg日粮的鸡所产蛋的可食部分碘含量高出近3倍。结果表明，日粮碘水平对产蛋量、产蛋质量、采食量和饲料转化率无显著影响。日粮碘水平的增加会使蛋中碘积累增加，10 mg/kg CI的水平可使蛋中碘富集。
