Abstract
The study was conducted in the Poultry Farm in the Technical College AL-Mussayab during the period that began at the 1st of November 2016 till the 5th of December 2016, to investigate the effect of substitution imported by local premixes on carcass traits of broiler. A total of 540 one day old broiler chicks (Ross 308) were used, chicks were randomly distributed into 9 treatments, with 2 replicates per treatment (30 chick / replicate). Chicks fed on the experimental rations by supplementation 25 Kg Premix / ton feed, treatments were as follows; T1 control (contained a local premix), T2, T3 and T4 were contained Wafi, Provimi and Max Care premixes respectively. More over T5, T6 and T7 were contained a local premix with Wafi or Provimi or Max Care at rate 50: 50 respectively, T8 contained imported premixes (Wafi, Provimi and Max Care at a rate 1/3 for each), T9 contained all studied premixes, local and imported at rate ¼ for each one, to cover the requirements of birds according to the age period. Results revealed significant differences between treatments in dressing percent to T6. Meanwhile treatments did not differ between them in the relative weight of the main and secondary carcass cuts except for the relative weight of the drum stick where the surpassing was recorded for T7 on other treatments.
