اثر شكل خوراك (پلت و آردي)، سطوح مواد مغذي و انرژي قابل متابوليسم بر عملكرد جوجه هاي گوشتي

The effect of feed form (pellet and mash) and nutrients and metabolizable energy levels on performance of broiler chickens

This experiment was conducted in order to compare the effect of feed form (pellet vs. mash), dietary nutrient density and metabolizable energy (min vs. max requirement) on performance of broiler chicks. For this purpose, growth response of eight hundred Ross 308 male broiler chicks was evaluated in a completely randomized design with a factorial 2><2 arrangement (2 factors including pelleted form and dietary nutrient density each at two levels), and eight replicates for each treatment. A number of 25 birds were allocated to each treatment. Results of this experiment showed that high level of nutrient and metabolizable energy density and also feed pelleting significantly increased weight gain (P<0.05). Feed dietary nutrient and metabolizable energy density affected feed intake in the first and third week of ages (P<0.05). Increasing of dietary nutrient density did not affect feed conversion ratio, but pelleted form of feed significantly improved feed conversion ratio during whole period of experiment (P<0.05). Birds fed with pelleted diet had higher mortality than those fed with mash diet. Dietary nutrient density had no effect on meat yield cost, but pelleted of feed resulted in decrease of meat yield cost. The result of experiment showed that feeding birds with pelleted diet and high level of nutrient and metabolizable energy would improve performance of broiler chickens.