كليدواژه :
Diet dilution , Performance , Compensatory growth , Broiler , دامپروري , جوجه گوشتي , رقيق سازي جيره , رشد جبراني , محدوديت غذايي
چكيده لاتين :
A total of 720 Ross chicks were grown in each of 24 separate floor pens until six weeks of age. In an experiment of completely randomized design, the effects of energy and protein dilution, while utilizing rice hull at 0, 10, 15, 20, 25 and 30%, during 6 to 12 days of age (starter) on broiler performance were examined. Metabolizable energy and crude protein content of the experimental diets were as follows: 3089, 2780, 2626, 2472, 2317, 2163 Kcal/Kg; and 21.45, 19.29, 18.23, 17.16, 16.1 and 15.02 percent, respectively. From day 13 to 21 days of age a conventional starter and thereafter a finisher diet was used. During the period of study the chicks had free access to mash feed and water. The chicks were pen weighed periodically, feed intake being measured at the end of each phase of feeding period on a pen basis as well. Between day 6 to 12, diet dilution increased feed consumption, reduced body weight gain as well as energy and protein intake. Due to compensatory growth no significant differences among treatments in body weight were observed. Feed intake following feed restriction period was less for the birds receiving diluted diet as compared to control. Meanwhile, feed efficiency was somewhat improved among birds fed with diluted diets. Nevertheless, this difference was not statistically significant. Diet dilution, indicated no significant effect on carcass composition, liver, and abdominal fat percentage at the slaughter age. In this experiment 20 and 25% dilution diets resulted in a slight increase in body weight gain and improved production efficiency.
