Effects of dietary vitamin E supplementation on laying performance, hatchability, and antioxidant status in molted broiler breeder hens.

Dietary vitamin E supplementation has been indicated to enhance the antioxidant capacity of breeders. As breeders age, the productive and reproductive performance rapidly decline, and dietary vitamin E supplementation may play a positive role in this process. Two trials were conducted to evaluate the effects of dietary vitamin E supplementation on laying performance, hatchability traits and antioxidant status in molted broiler breeder hens beyond 70 wk. A total of 512 (71-week-old) and 576 (75-week-old) molted Ross 308 breeder hens were assigned to 2 dietary vitamin E groups (6 or 100 mg/kg) and 3 dietary vitamin E groups (100, 200 or 400 mg/kg) for 12 wk, respectively. Eggs were collected and incubated at wk 9. Dietary vitamin E supplementation did not affect the laying performance of hens and the hatchability traits of eggs (P > 0.05). As dietary vitamin E concentration increased, the malonaldehyde (MDA) content in ovarian of hens, egg yolks and serum, brain, and yolk sac of chicks decreased (P < 0.05), the total antioxidant capacity (T-AOC) in serum and ovarian of hens, egg yolks and yolk sac of chicks increased (P < 0.05), and the alpha-tocopherol content in egg yolks increased (P < 0.05). In conclusion, dietary vitamin E supplementation did not influence egg production and hatchability traits. However, based on optimizing the antioxidant status of egg yolks and newly hatched chicks, the suitable vitamin E concentration in the molted broiler breeder hen (beyond 70 wk) diet is at least 200 mg/kg. [ABSTRACT FROM AUTHOR]