Different levels of energy and protein an their effects on laying performance of native breeder hens of Isfahan province

This expeiment was conducted to study the performance and reproductive characteristics of breeder native hens provided in the Isfahan Experimental station of native Hens (IESNH). The experiment was designed in a 3 * 3 factorial with 3 levels of ene~' (2750. 2500 and 2250 Kcal ME/Kg) and 3 levels of protein (17 _ /4/5 and J 2% CP) with se~'erI replicates. During the laying period (24 - 71 WK) feed intake, sexual maturity (dge at which the first egg laied]. dllily egg production (hen - day), egg weight, egg mass, feed conversion (gr feed Igr egg mass), body weight, egg quality (Haugh unit, Yolk weight. egg shell streght), [ertilitv and hatchability were recorded. Various levels of high, mid and low energy (2750, 2500 and 2250 Kcal ME/ Kg respectively) did not have any significant effects on daily egg production (49.1 . 48.5 and -li.5 % respectively] , egg weight (56.3 r 56.1 and 55.7 gr res.) ,feed conversion 4.86, 4.81 and -1.68 res. J. Egg mass production. [ertility early and mid (0 . 7 and 7 - J 4 days of incubation) dead embryos. Haugh unit and egg shell' strenght (P0.05). But betwen high and low energy diets was significant differences about yolk weight (17.3 gr vs. 16.6 gr) and chick weight (38.4 vs. 37.5 gr) (P0.05). Also highest hatchability and lowest late dead embryos belonged to groups which fed, mid energy diet during the laying period (76. 7% lind 11.0% res.] Various levels of high, mid and low protein (17, 14.5 and 12% CP). Also did not have al1)' significant effects on egg weight (56.4 ,55.9 and 55.8 gr res.) , fetid conversion (4.79, 4.76 and 4.8 res.), sexual maturity , first egg weight, yolk weight J Haugh unit, feniJity and early or mid dead embryos (P0.05). Daily feed intake, egg production and late dead embryose (19 - 21. days of incubation) were significantly higher in breed hens fed high protein than 10K' protein diet (133.4 r's 124.4 grkiay ; 49.8 v.s 46.2% and 11.3 v.s 4.8 % res.] (PO.05). But egg srrenght and hatchability were significantly improved in breeder hens fed low protein than high protein diet (3.1 vs. 2.8 Kglcm and 77.2 vs. 77.6% res.) Acording to this study the suitable egg production , egg weight , feed conversion , fertility and hatchabilily in the breed native hens can be achieved by feeding of mid ~ and Protein diet (2500 KcaJ Me/Kg and 14/5%CP). during the laying period.