Department of Environment, Animal Hygiene and Welfare, Wroclaw University of Environmental and Life Sciences, Wrocław, Poland.
Poult Sci. 2012 Jul;91(7):1627-32. doi: 10.3382/ps.2011-02031.
The aim of the study was to evaluate the effect of iodine yeast (I-yeast) supplementation on the performance, egg traits, and iodine content of eggs of laying hens. The experiment was conducted as a completely randomized design. A total of 60 laying hens (Hy-Line Brown), 25 wk of age, was divided into 3 groups (4 replicates), and a feeding experiment was conducted for 12 wk. The concentrations and forms of iodine added to the basal diet were as follows: control group, 1 mg of iodine/kg of feed, Ca(IO(3))(2)•H(2)O; experimental groups E1 and E2, 1 and 2 mg of iodine per kilogram of feed, I-yeast, respectively. The iodine yeast did not significantly affect BW gain. Lower level of hen day egg production for groups E1 and E2 was not confirmed statistically; however, it was probably the consequence of low replication. Feed intake was the lowest in the E1 group and feed conversion rate was the highest in the E2 group. Furthermore, the egg and albumen weight was the highest in the group supplemented with 2 mg/kg of iodine from I-yeast (P < 0.05). The concentration of iodine in the egg yolk from groups E1 and E2 was respectively about 80 and 90% higher, compared with the control group. Eggshells from the group fed with 2 mg/kg of I-yeast contained almost 3 times more iodine than eggshells from the control group. The results suggest that iodine yeast supplementation in the diet of laying hens is an effective method for increasing iodine concentration in eggs and thus could contribute to elimination of iodine deficiency disorders in humans consuming iodine-enriched eggs.
本研究旨在评估碘酵母（I-yeast）补充剂对产蛋鸡的生产性能、蛋品质和蛋中碘含量的影响。试验采用完全随机设计，选用 25 周龄海兰褐蛋鸡 60 只，随机分为 3 组（每组 4 个重复），进行为期 12 周的饲养试验。基础饲粮中碘的浓度和形式分别为：对照组，碘添加量为 1 mg/kg 饲料，添加形式为 Ca(IO(3))(2)•H(2)O；试验组 E1 和 E2 分别为 1、2 mg/kg 饲料，添加形式为碘酵母。碘酵母的添加并未显著影响 BW 增重。E1 和 E2 组母鸡产蛋率略低，但统计学上不显著；可能是由于重复数较少导致的。E1 组的采食量最低，E2 组的料蛋比最高。此外，E2 组（添加 2 mg/kg 碘的碘酵母）的蛋重和蛋白重最高（P < 0.05）。E1 和 E2 组蛋黄中的碘浓度分别比对照组高约 80%和 90%。E2 组的蛋壳中碘含量比对照组高近 3 倍。结果表明，在产蛋鸡饲粮中添加碘酵母是提高鸡蛋中碘浓度的有效方法，有助于消除人类因食用富碘鸡蛋而碘缺乏的问题。
