Response of Laying Hens to Dietary Vitamins A, E and Selenium Supplementation During Summer Months

The current study aimed to investigate the effects of extra dietary supplementations of vitamins A, E and Selenium and their interactions on the performance of laying hens during summer months. A total of 243 Bovans laying hens 42 weeks old were randomly distributed into a factorial design experiment (333); including 3 levels of vitamin A (0, 8000, 16.000 IU/kg diet), 3 levels of vitamin E (0, 250, 500 mg/kg diet) and 3 levels of inorganic-selenium, (0, 0.25, 0.50 mg/kg diet).