نوع مقاله : مقاله علمی- ترویجی
نویسندگان
1 دانشجوی دکتری تخصصی تغذیه طیور، گروه مهندسی علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، آذربایجان شرقی، ایران
2 استاد گرایش تغذیه طیور، گروه مهندسی علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، آذربایجان شرقی، ایران
3 دانشیار گرایش تغذیه طیور، گروه مهندسی علوم دامی، دانشکده کشاورزی، دانشگاه تبریز، تبریز، آذربایجان شرقی، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
This study was conducted to evaluate the effects of different levels of mineral premixes on weight of lymphoid organs of broiler chickens in 49 days assay. A 480 day-old ROSS 308 broiler chickens were assigned in a completely randomized design with 6 treatments and 4 replicates and 20 chicken per each. Experimental diets were:1- diet containing trace mineral premixes with recommended levels of NRC (1994), 2- diet containing trace mineral with recommended levels of Brazilian tables 3-supplementation trace minerals according to ROSS 308 nutrient recommendation, 4-supplementation trace minerals according to 80% of ROSS 308 nutrient recommendation, 5-supplementation trace minerals according to 60% of ROSS 308 nutrient recommendation. 6-negative control (without trace mineral premix supplementation). The experiment started on day 21. In order to examine the relative weight of lymphoid organs including the thymus, spleen, and bursa of Fabricius at the end of the period (49 days), two male chickens from each treatment group were randomly slaughtered and the desired factors were assessed. The results indicated that there was no significant difference in the relative weight of the lymphoid organs, including the thymus, spleen, and bursa, between the control group and the experimental groups (p<0.05). Overall, based on the obtained results, it can be concluded that the levels of trace minerals in the diet of Ross broiler chickens can be reduced during finisher period without adverse effects on the relative weight of lymphoid organs.
کلیدواژهها [English]