TY - JOUR JF - JCPP JO - VL - 7 IS - 3 PY - 2003 Y1 - 2003/10/01 TI - Effects of Dietary Cumulative Levels of Cotton-seed Meal on the Performance of Broiler Chickens at Different Ages TT - تأثیر استفاده از مقادیر افزایشی کنجاله پنبه دانه در جیره، بر عملکرد جوجه‌های گوشتی در سنین مختلف N2 - This experiment was conducted to study the effects of using cotton-seed meal on the performance and carcass yield of broiler chickens at different ages. The experiment was performed in a completely randomized design with four treatments and five replicates for each treatment. The experimental treatments included the levels of 0, 3.5, 7, and 10.5% of cotton-seed meal in diets fed to chickens at 7-21 days of age. Except for the control group, these levels for grower (21-42 d of age) was increased to 7, 14, and 21% and for finisher (42-56 d of age) to 14, 21, and 21%, respectively. For the purposes of this study, 260 day-old chicks were reared in litter until 7 days of age. On day 7, chicks were divided into 20 pens with 13 chicks in each pen. NRC (1994) recommendation was used in balancing experimental diets. The chickens were weighed weekly throughout the experimental period (7-56 d). The main observations were body gain, feed intake and feed conversion ratio. Physical analysis of carcass was done at the end of the experimental period and percentages of carcass, abdominal fat, liver, pancreas and digestive tract to live body weight were calculated. The use of cotton-seed meal and the increase of the levels through different ages had no significant effects on body weight, daily gain, feed intake, feed conversion ratio, and carcass components. Increasing the level of cotton-seed meal in the diet at 7-21 days of age had significant effects on feed intake (P SP - 145 EP - 151 AU - A. A. Gheisari, AU - O. Saraeian, AU - M. Toghiani, AU - D. Asadian, AD - KW - Broiler chicken KW - Cotton-seed meal KW - Body weight KW - Carcass yield. UR - http://jcpp.iut.ac.ir/article-1-450-en.html ER -