This experiment was conducted to study the effect of vitamin E levels on sex hormone secretion and antioxidant indices of primiparous laying ducks at low ambient temperatures (1~7 ℃). A total of 216 (18 weeks of age) Jinding laying ducks with average weight of (1.68±0.01) kg were randomly divided into 6 treatments with 6 replicates, and each replicate comprised 6 ducks. The ducks in the 6 treatments were fed corn-soybean basal diets (vitamin E content was 7.9 IU/kg) supplemented with 17.1 (control group), 57.1, 92.1, 142.1, 192.1 and 242.1 IU/kg vitamin E, respectively. The results showed as follows: the secretion of follicle-stimulating hormone (FSH) was significantly enhanced when supplemented with 142.1 and 192.1 IU/kg vitamin E in diets (P<0.05). The secretion of luteinizing hormone (LH) and estradiol (E2) were significantly enhanced when supplemental levels of vitamin E in diets were from 57.1 to 192.1 IU/kg (P<0.05), and the highest content was found in the group with the diet containing 142.1 IU/kg vitamin E. Compared with the control group, the serum progesterone (P4) content in all groups was significantly increased except the group with the diet supplemented with 142.1 IU/kg vitamin E (P<0.05). No significant effect of vitamin E on serum cortisol (Cort) content was found among all groups (P>0.05). The activities of liver glutathione peroxidase (GSH-Px) and serum superoxide dismutase (SOD) had significantly increased when supplemented with 142.1 and 192.1 IU/kg vitamin E in diets (P<0.05), and the liver SOD activity in the group with the diet supplemented with 142.1 IU/kg vitamin E was also significantly increased (P<0.05). The supplementation of 57.1, 92.1, 142.1, 192.1 and 242.1 IU/kg vitamin E in diets could significantly decrease the malondialdehyde (MDA) content in serum and liver (P<0.05), and the lowest content of MDA was found in the group with the diet containing 142.1 IU/kg vitamin E . The T-AOC and CAT activity in serum and liver were not significantly affected by vitamin E supplemental levels (P>0.05). It is concluded that supplementation of 142.1 IU/kg vitamin E in corn-soybean diet can enhance the secretion of FSH, LH and E2, and improve the antioxidant ability of primiparous laying ducks.［Chinese Journal of Animal Nutrition, 2011, 23（10）：1703 -1709］
JIN Fengtao,WANG An,HU Chenhui
. Effect of Vitamin E Levels on Sex Hormone Secretion and Antioxidant Indices of Primiparous Laying Ducks at Low Ambient Temperatures[J]. Chinese Journal of Animal Nutrition, 2011
, 23(10)
: 1703
-1709
.
DOI: 10.3969/j.issn.1006-267x.2011.10.009
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