Effect of Regulating Dietary Iodine and Selenium Level for Laying Hens on Transfer of Dietary Iodine and Selenium into Chicken Eggs

Thirty 278-day old hens were divided into three groups randomly and fed with diets containing 0. 5 mg Ⅰ and 0. 2 mg Se· kg -1(control group), 50 mg Ⅰ and 1. 2 mg Se ·kg 1 (goup Ⅰ), and100 mg Ⅰ and 2. 2 mg Se · kg-1 (group Ⅱ ), respectively, for 8 weeks. The changes of iodine and selenium in egg were observed. The results showed that, compared with control group, yolk iodine contents in group Ⅰ and group Ⅱ were increased by 1081% and 1337%, yolk selenium contents by 351% and 634%. Egg white iodine and selenium contents were significantly increased. And iodine and selenium in plasma were also synchronously enhanced. Those results suggested that regulating dietary iodine and selenium level for laying hens could cause much higher iodine and selenium in egg. So, the laying hen could be used as an effectual biologic transporter to transfer iodine and selenium from diet into egg.