Effects of Energy and Digestible Methionine Level in Diet on Performance and Reproductive Traits of Arian Broiler Breeder Hens during Production Period

A 28-week experiment was conducted to study the effects of dietary energy and digestible methionine level on performance and reproductive traits of broiler breeder hens, using 280 Arian broiler breeder hens and 20 males at 26 weeks of age. The experiment was done as 2×2 factorial arrangement in a completely randomized design with 4 treatments and 5 replicates. Dietary treatments were formulated with 2 levels of energy (2740 and 2540 kcal/kg) and 2 levels of digestible methionine (0.25 and 0.28%). Dietary energy level had no significant effect on egg production, egg weight and feed conversion ratio, but hens were received lower energy level had a lower daily weight gain compared to the hens received recommended energy level (P