Sumaiya Shaikh, Nayak Sunil, Baghel R P S, Nayak Anju, Malapure C D, Kumar Rajesh
Department of Animal Nutrition, College of Veterinary Science and Animal Husbandry, Jabalpur - 482 001, Madhya Pradesh, India.
Department of Veterinary Microbiology, College of Veterinary Science and Animal Husbandry, Jabalpur - 482 001, Madhya Pradesh, India.
Vet World. 2016 Jun;9(6):554-8. doi: 10.14202/vetworld.2016.554-558. Epub 2016 Jun 4.
Objective of this study was to investigate the effect of different levels of iodine supplementation on iodine content of eggs in laying hens.
In the experiment, 135 laying hens (White Leghorn) of 55 weeks age were randomly distributed to 5 dietary treatments; each group contained 27 laying hens distributed in three replicates of 9 birds each. Diet T1 was control basal layer diet without iodine enrichment in which iodine content (I2) was as per NRC recommendation. Basal diets were supplemented with calcium iodate (Ca (IO3)2) at 5, 10, 15 and 20 mg/kg in T2, T3, T4 and T5 groups, respectively. The iodine content in the calcium iodate is 65.21%, therefore, the diets T2, T3, T4 and T5 contained 3.25, 6.50, 9.75 and 13.0 ppm iodine, respectively. The laying hens were fed the respective experimental diets ad libitum during the experimental period of 10-week. The iodine content of egg yolk and albumen was analyzed at the end of 5(th) and 10(th) week of the experiment. Economics of feeding for the production of iodine enriched egg was calculated at the end of the experiment.
Increasing iodine levels in diet of hens from 0.45 to 13.0 ppm significantly increased egg iodine concentration, the highest concentration of egg iodine was observed in the group fed diet supplemented with 13.0 ppm iodine followed by those fed 9.75, 6.50, 3.25 and 0.45 ppm iodine in diet. There was no significant difference in the iodine levels of unboiled versus boiled eggs. Therefore, the consumers are ensured to receive the optimal levels of iodine from boiled iodine-enriched eggs. Among different diets, minimum and significantly lower feeding cost (Rs. per dozen or per kg eggs) was noticed in hens allotted T3 diet (6.50 ppm I2). However, feeding cost of hens receiving 3.25 and 9.25 ppm I2 was statistically (p<0.05) similar to control group (T1). Further, it was noticed that feeding cost (Rs. per dozen or per kg eggs) was significantly increased due to the inclusion of higher level of iodine (13.0 ppm).
It was concluded that supplementing iodine at 6.50 ppm in layers diet was economically better for the production of iodine enriched eggs followed by feed iodine supplementation at 3.25 ppm as compared to control and other treatment groups.
本研究的目的是调查不同碘添加水平对蛋鸡所产鸡蛋碘含量的影响。
实验中，将135只55周龄的白来航蛋鸡随机分为5种日粮处理组；每组包含27只蛋鸡，分为3个重复，每个重复9只鸡。日粮T1为不添加碘的对照基础蛋鸡日粮，其碘含量（I2）符合美国国家研究委员会（NRC）的建议。在T2、T3、T4和T5组的基础日粮中分别添加5、10、15和20mg/kg的碘酸钙（Ca(IO3)2）。碘酸钙中的碘含量为65.21%，因此，日粮T2、T3、T4和T5的碘含量分别为3.25、6.50、9.75和13.0ppm。在为期10周的实验期内，给蛋鸡随意投喂各自的实验日粮。在实验的第5周和第10周结束时分析蛋黄和蛋清的碘含量。在实验结束时计算生产富碘蛋的饲养成本。
将母鸡日粮中的碘水平从0.45ppm提高到13.0ppm显著提高了鸡蛋的碘浓度，在饲喂添加13.0ppm碘日粮的组中观察到鸡蛋碘浓度最高，其次是饲喂碘含量为9.75、6.50、3.25和0.45ppm日粮的组。未煮鸡蛋和煮过鸡蛋的碘水平没有显著差异。因此，可确保消费者从煮过的富碘鸡蛋中获得最佳水平的碘。在不同日粮中，分配到T3日粮（6.50ppm I2）的母鸡的饲养成本最低且显著低于其他组（每打或每千克鸡蛋的卢比数）。然而，接受3.25和9.25ppm I2的母鸡的饲养成本在统计学上（p<0.05）与对照组（T1）相似。此外，还注意到由于添加了较高水平的碘（13.0ppm），饲养成本（每打或每千克鸡蛋的卢比数）显著增加。
得出的结论是，与对照组和其他处理组相比，在蛋鸡日粮中添加6.50ppm碘在生产富碘蛋方面在经济上更具优势，其次是添加3.25ppm碘的日粮。
