title: Effect of crumble-pellet and mash diets with different levels of dietary protein and energy on the performance of broilers at the end of the third week.
abstract: This experiment was conducted to investigate the effect of the form of diets with different levels of protein and energy on broilers performance at the end of the third week. A total of 2800 male broiler chicks were fed with two forms of diet (mash and crumble-pellet), two levels of protein (23% and 21% CP), and two levels of energy (3200 and 3000 Kcal/Kg ME) from 1 to 21 days of age. The bodyweight (BW) and Feed conversion rate (FCR) were affected by the form of diet with the crumble-pellet form being better (P < .001). The diet with high protein significantly increased BW and decreased FCR (P < .001). The different levels of energy did not affect FCR and BW in crumble-pellet diet but should a significant effect on them in mash diet (P < .05). There were no significant interactions for any of the parameters tested except for interactions between energy and feed form. BW and FCR were improved by energy when diets were fed in the mash form (unlike the crumble-pellet form) at all ages. It is concluded that feeding crumble-pellets from 1 to 21 days of age improved BW and FCR and that an increase in the protein (unlike energy) content of the diet increased the performance of the chickens at the end of the third week.
authors.affiliation: Faculty of Veterinary Medicine, University of Tehran, P.O. Box 14155-6453, Tehran, Iran.
authors.forename: S
authors.initials: S
authors.lastname: Jafarnejad
authors.forename: M
authors.initials: M
authors.lastname: Farkhoy
authors.forename: M
authors.initials: M
authors.lastname: Sadegh
authors.forename: A R
authors.initials: AR
authors.lastname: Bahonar