RT - Journal Article T1 - Effect of Different Levels of Energy and Protein on Laying Performance of Fars Native Hens During the First Phase of Production JF - JSTNAR YR - 2007 JO - JSTNAR VO - 10 IS - 4 UR - http://jstnar.iut.ac.ir/article-1-635-en.html SP - 447 EP - 460 K1 - Fars native hen K1 - Energy K1 - Protein levels. AB - An experiment was carried out to investigate the effects of different levels of energy (2700, 2900 and 3100 kcal/kg) and protein (13, 14.5 and 16 %) on laying performance of Fars native hens during the first phase of production. Two hundred and sixteen 25-week-old native pullets were put into fifty four groups of similar live weight (994 ± 169 gr) of four chickens, which were randomly allocated to nine experimental diets. Each treatment was replicated six times in factorial CRD design (3×3). At each level of energy, three diets were formulated to contain three levels of protein (16, 14.5 and 13%). The diets were fed ad libitum for a period of 20 weeks (week 25-45). The treatments 1 with 3100 kcal/kg ME and 16% protein and 3 with3100 kcal/kg ME and 13% protein had less daily feed consumption than treatment 7 with 2700 kcal/kg ME and 16% protein (90.50 and 87.30 vs 101.20 gr respectively, P LA eng UL http://jstnar.iut.ac.ir/article-1-635-en.html M3 ER -