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total number of 198 local Sinai birds (180 ♀ and 18 ♂) 14-weeks-old were weighed and divided into six dietary treatments to determine the nutritional requirements of crude protein (CP) and metabolizable energy (ME) on growth performance and nutrients digestibility during the growing period (13-18 weeks of age) and subsequent effect during laying period from 23 to 32 weeks of age. The dietary levels of CP and ME included 3x2 factorial design (13, 14 and 15 CP, each contained 2650 and 2700 ME). The results obtained indicated that BW at the end of grower period increased significantly with the diet contained 15% CP+2700 Kcal/Kg diet followed by those fed diet contained 14% CP + 2650 Kcal/Kg diet as compared to the other dietary groups. The best value of feed conversion ratio was observed with the diet contained 15% CP + 2700 Kcal/Kg diet followed by the diet with 14% CP + 2650 Kcal/ Kg diet. In respect of sexual maturity (SM) the pullets fed diet contained 14% CP + 2650 Kcal/ Kg diet reached to SM at earlier age (139 days). the values of crude fiber digestibility was significantly increased in the pullets fed diet contained 14% + 2650 kcal/Kg diet compared to those fed the diet with 15% CP+2650 Kcal/Kg diet. The birds fed previous grower diet contained 15% CP + 2700 Kcal/Kg diet ME recorded significantly the highest value of feed intake compared to the other dietary treatments except for the diet with 14% CP+2650 Kcal/Kg diet ME and 14% CP+ 2700Kcal/ Kg diet ME. Subsequent significant effect was observed on feed conversion ratio where there was significantly improved due to the grower diet contained 14% CP + 2650 Kcal/Kg diet ME compared to the other treatments except for the grower diet included CP 15% +2700 Kcal/Kg diet. The most remarkable was observed with the hens fed previous grower diet contained 14 CP% + ME 2650 Kcal/Kg diet where there was a significant increase in economic efficiency compared to the other dietary treatments except for those fed grower diet with CP 15% + ME 2700 Kcal/Kg diet. The results in the current study illustrated that the Sinai birds during the growing period (13-18 weeks of age) require 14%dietary crude protein and 2650 Kcal/kg metabolizable energy diet to optimal performance during the growing and laying periods.

egyptian journal of nutrition and feeds

EFFECT OF DIFFERENT LEVELS OF DIETARY CRUDE PROTEIN AND METABOLIZABLE ENERGY ON PRODUCTIVE PERFORMANCE OF LOCAL SINAI POULTRY STRAIN DURING THE GROWING PERIOD AND SUBSEQUENT LAYING PERFORMANCE