Abstract: This study was conducted to evaluate the economic value of broiler chicken diet containing different levels of energy and protein with constant ratio. Three hundred sixty 1 day old commercial broiler chickens randomly were assigned to three experimental diets. Experimental diets were formulated to have 3 levels of CP and ME, in each feeding phase: 23, 21 and 20% CP with 3031.63, 2768 and 2636 kcal kg-1 in the starter phase (1-10 days); 22, 20 and 19% CP with 3174.25, 2886 and 2742 kcal kg-1 in the grower phase (11-25 days) and 20, 18 and 17% with 3224, 3063 and 2902 kcal kg-1 in the finisher phase (26-42 days). Therefore, the experiment diets were containing: 23, 22 and 20% CP and 3031.63, 3175.24 and 3224 kcal kg-1 ME; 21, 20 and 18% CP and 2768, 2886 and 3063 kcal kg-1; 20, 19 and 17% CP and 2636, 2742 and 2902 kcal kg-1, respectively for starter, grower and finisher. The ratio of energy and protein was constant at 131.81, 144.33 and 161.2 in the starter, grower and finisher periods, respectively. The 1 day old Ross-308 broiler chickens were randomly divided into 30 experimental pens, 12 chickens in each pen and each diet was offered to 10 replicates (pen) randomly. The results showed that in compared with control group cost (kg) of feed decreased with decreasing protein and energy in diets. At whole of experiment period (0-42 days), feed intake (4500.30 vs. 4226.46 g) and feed conversion ratio (2.27 and 1.89) in diet 2 was significantly more than control diet (p<0.05) but there was no significant difference with diet 1 (p>0.05). At whole period of experiment (0-42 days) linearly, the cost of meat production was higher in diets containing low levels of protein and energy (p>0.05) but in grower phase (11-25 days) the cost linearly decreased. Although, the low protein and energy diet was cheaper but as its FCR was higher (the worse) therefore the cost of 1 kg meat was more than control diet.
Moona Moosavi, Moosa Eslami, Morteza Chaji and Mohammad Boujarpour, 2011. Economic Value of Diets with Different Levels of Energy and Protein with Constant Ratio on Broiler Chickens. Journal of Animal and Veterinary Advances, 10: 709-711.