The experiment was conducted to study the effect of different levels of dietary selenium (Se) on growth performance, immune function and endocrine of growing laying ducks (5 to 11 weeks). One hundred and fifty 5-week-old Jinding laying ducks with average body weight of (0.36±0.01) kg were chosen and randomly divided into 5 groups with 6 replicates per group and 5 ducks per replicate. The ducks in the 5 groups were fed basal diets (Se content was 0.04 mg/kg) supplemented with 0 (control group), 0.08, 0.16, 0.36 and 0.66 mg/kg Se (actual additives was sodium selenite), respectively. The trial lasted for 7 weeks. The results showed as follows: 1)supplemented with 0.08 and 0.16 mg/kg Se in diets significantly improved average daily gain, and reduced the ratio of feed to gain (P<0.05). 2) Compared with the control group, the fresh weight of spleen and Fabricius bursa, and index of Fabricius bursa in the group with the diet containing 0.08 mg/kg Se, and the interleukin-2 (IL-2) content in the two groups with the diet containing 0.08 and 0.16 mg/kg Se, respectively, were significantly increased (P<0.05), while the indices of spleen and thymus, fresh weight of thymus and serum total protein (TP) content were not influenced by different levels of Se (P>0.05). 3) With increasing Se levels, serum triiodothyronine (T3) content was firstly increased and then decreased , while the serum thyroxine (T4) content was firstly decreased and then increased, but no significant differences were found among all groups (P>0.05). The serum growth hormone (GH) content in the group with the diet containing 0.16 mg/kg Se was higher than that in the control group and the group with the diet containing 0.66 mg/kg Se (P<0.05). It is concluded that supplementation of Se from 0.08 to 0.16 mg/kg in diets can improve growth performance and immune function, and regulate related hormone secretion of growing laying ducks.［Chinese Journal of Animal Nutrition, 2011, 23（10）：1697 -1702］
FENG Jing,WANG An,HUO Siyuan
. Effect of Selenium Supplementation on Growth Performance, Immune Function and Endocrine of Growing Laying Ducks[J]. Chinese Journal of Animal Nutrition, 2011
, 23(10)
: 1697
-1702
.
DOI: 10.3969/j.issn.1006-267x.2011.10.008
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