Effects of Feeding Graded Levels of Dietary Metabolizable Energy and Crude Protein on the Growth Performance of DZ-White Chicken Strain


Tewodros Fekadu
Gebreyohannes Berhane
Mammo Mengesha
Misba Alewi


A feeding trial was conducted to determine an optimum combination of metabolizable energy (ME, kcal/kg) and crude protein (% CP) levels for the DZ-White chicken strain at the Debre-Zeit Agricultural Research Center. The experiment had three phases: starter (0-8), grower (9-14), and pullet (15-19 weeks).  The experimental diets were formulated containing different levels of proteins as 19, 18 or 17, 18, 17 or 16, and 17, 16 or 15% CP for starters, growers, and pullets, respectively.  Similarly, metabolizable energy was also leveled as 2900, 2750, or 2600 kcal/kg-as feed basis for both starters and growers and 2850, 2750, or 2650 kcal/kg for pullets. A total of 1260 unsexed one-day-old DZ-White chicks were randomly allocated on nine dietary treatments, with 3x3 factorial arrangements, in a Completely Randomized Design (CRD).  Chemical compositions of feed ingredients were analyzed and the body weight, feed intake, and feed conversion ratio were recorded. The results indicated that dietary treatments with varied levels of ME and CP showed a significant (P < 0.05) effect on the feed intake of chickens at the starter phase, but not at the grower and pullet phases. The growth performance of the chickens was significantly (P < 0.05) influenced by dietary proteins and energy in the three experimental phases. The feed conversion ratio and body weight gain were increased in diets containing 19% CP with 2900 kcal/kg of ME in growers and 17% CP with 2750 kcal/kg of ME in pullets. From this study, it can be concluded that for maximum growth and better feed utilization DZ-White chickens need a diet with 19% CP in the starter and 17% CP in grower phases each with 2900 kcal/kg of ME and 17% CP with 2750 kcal/kg of ME in pullet phase.


How to Cite
Fekadu, T., Berhane, G., Mengesha, M., & Alewi, M. . (2022). Effects of Feeding Graded Levels of Dietary Metabolizable Energy and Crude Protein on the Growth Performance of DZ-White Chicken Strain. International Journal of Livestock Research, 12(4), 7–16. Retrieved from https://ijlr.org/ojs_journal/index.php/ijlr/article/view/54


  1. AOAC, Association of Official Analytical Chemist (2016): Official Methods of Analysis, 20th Edition, Washington, DC.
  2. Byerly T., Roland D. & Gunawardana, P. (2008): Effect of energy and protein on performance, egg components, egg solids, egg quality, and profits in molted Hy-Line W-36 hens. Journal of Applied Poultry Research .17:432e9.
  3. Etalem, T., Wondmeneh E., Kasech M. & Tadios H. (2019): Effect of Energy-Protein Optimization on the Growth and Production Performances of Local Chickens. Acta Scientific Nutritional health, volume 3 issue 2.
  4. Halima, H.M., (2007): Phenotype and genetic characteristics of indigenous chicken populations in North West Ethiopia. PHD Thesis, submitted to University of Free State, Bloemfontein, South Africa, pp: 186.
  5. Hussein, M.A.A., El-Kloub K., El Moustafa M., Gad El-hak M.K. & Abbas, A.M. (2010): Optimal metabolizable energy and crud protein levels for Sinai laying hens. Egypt Poultry Science, 30, 1073-1095.
  6. Jacob, J., Wilson, H.R., Miles, R.D., Butcher, G. D., & Mather, F.B. (2014): Factors affecting egg production in backyard chicken. University of Florida, 1-8.
  7. Kumar, S., Singh, P. K., & Prasad, A. (2009): Effect of graded level of dietary energy and protein on the growth performance of cockerels. Indian Journal of Animal Nutrition, 26(1), 86-89.
  8. Lotfi, E., Karimi, N., Parizadian Kavan & Sharifi, M. (2018): Influence of different dietary levels of energy and protein on reproductive and post hatch growth performance in Japanese quails. Iranian Journal of Applied Animal Science, 8(1), 137-145.
  9. Mulugeta, S., Goshu, G., & Esatu, W. (2020): Growth performance of DZ-white and Improved Horro chicken breeds under different agro-ecological zones of Ethiopia. Journal of Livestock Science 11, 45-53.
  10. Nahashon, S. N., Adefope, N. A., Amenyenu, A., & Wright, D. (2007): Effect of varying concentrations of dietary crude protein and metabolizeable energy on laying performance of pearl grey guinea fowl hens. Poultry science, 86(8), 1793-1799.
  11. Novak, C., Yakout, H. M., & Scheideler, S. E. (2006): The effect of dietary protein level and total sulfur amino acid: lysine ratio on egg production parameters and egg yield in Hy-Line W-98 hens. Poultry science 85(12), 2195-2206.
  12. NRC (National Research Council, (1994): Nutrient requirements of poultry, eighth revised edition. Washington, D.C. National Academy Press.
  13. Nsoso, S. J., Mareko, M., Manyanda, S., & Legodimo, P. (2008): The effect of housing type on body parameters, feed intake and feed conversion ratio of guinea fowl (Numida meleagris) keets and chemical composition of their meat during growth and development in Botswana. Research Journal of Animal Science, 2(2), 36-40.
  14. Pagani, P and Wossene, A. (2008): Review of the new features of the Ethiopian poultry sector Bio-security implications. Food and Agriculture Organization of The United Nations, Page 28.
  15. Perez-Bonilla, A., Novoa, S., García, J., Mohiti-Asli, M., Frikha, M., & Mateos, G. G. (2012): Effects of energy concentration of the diet on productive performance and egg quality of brown egg-laying hens differing in initial body weight. Poultry Science, 91(12), 3156-3166.
  16. Robinson, T.P. & Pozzi, F. (2011): Mapping supply and demand for animal sources food to 2030. Animal Production and Health Working Paper FAO, Rome, Italy.
  17. Sohail, S.S., Bryant, M.M., & Roland, D.A. (2013): Influence of dietary fat on economic returns of commercial Leghorns. Journal of Applied Poultry Research, 12 (3), pp. 356-361.
  18. Tuan, V.N., Bunchasak, C. & Chantsavang, S. (2010): Effects of dietary protein and energy on growth performance and carcass characteristics of Betong chickens during growing period. International Journal of Poultry Science 9 (5): 468-472.
  19. Wiseman J. (1987): Feeding of non‒ruminant livestock, 1st edition.