An experiment was carried out with 140 Arian broiler breeder hens and 20 males at 26 weeks of age. This experiment was done in 2×2 factorial arrangement in a completely randomized design with 20 experimental units and lasted 40 weeks. Dietary treatments were formulated with 2 levels of energy including 2740 and 2540 Kcal/Kg and two levels of digestible lysine (0.54 and 0.61 %). 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 high energy level (p<0.05). Increasing lysine level of diets, increased egg weight by 1.5 % (62.74 vs. 68.63%; p<0.05). However egg production, feed conversion ratio and body weight gain of these hens didn’t affect by lysine level. Hatchability of total eggs (65.39 vs. 73.40; p<0.05) and hatch of fertile egg (73.27 vs. 88.91, p<0.001) reduced by increasing energy level. Also, decreasing energy intake increased fertility (50.62 vs. 80.05; p<0.001) and grade one chicks (75.38 vs.92.26; p<0.001). The results show that use less energy and lysine levels in the diet of Arian broiler breeder improve reproductive performance.
Key words: Energy, Lysine, Broiler breeder, Reproductive performance.
Abstract published in Animal Science Journal (Pajouhesh & Sazandegi), Issue 117, pp: 193-203. doi: 10.22092/ASJ.2017.109726.1410.