%0 Journal Article %T The effects of polyunsaturated fatty acids on ascites incidence in broiler chickens %J Iranian Journal of animal Science %I پردیس کشاورزی و منابع طبیعی دانشگاه تهران %Z 2008-4773 %A Saki, Ali Asghar %A Haghighat, Mojtaba %A Yousefi, Azam %A Manafi, Milad %D 2015 %\ 09/23/2015 %V 46 %N 3 %P 325-334 %! The effects of polyunsaturated fatty acids on ascites incidence in broiler chickens %K acites %K broiler %K Malondialdehyde %K N3 fatty acids %K N6 fatty acids %K oxidative stress %R 10.22059/ijas.2015.56426 %X In order to evaluate the effect of polyunsaturated fatty acids on ascites incidence using this experiment was conducted 136 male one day (chicken Ross 308) in a completely randomized design with 2 treatments and 4 replication and 17 chickens in each replicate. Treatments includes: diet contain 4 % soybean oil (n3:n6:0.112) and diet include 5.5% poultry oil (n3:n6:0.201). Birds were raised up to 48 days of age and exposed to a cool temperature (15±1°C) from day 21 thereafter. Blood samples (2 mL) were obtained from the wing vein at 21 and 48 days of age. At 21 and 48 days of age, 2 birds in each replication were slaughtered and the hearts, Liver and pulmonary artery were removed and dissected to measure right ventricular hypertrophy. The results have shown diet with 5.5% poultry oil significantly decreased blood viscosity (P<0.05). However concentration of thyroxin, rectal temperature and glutamate dehydrogenase activity were also significantly increased in this treatment (P<0.05). Malondialdehyde as an oxidative stress index significantly increased by diet contain 5.5% poultry oil. Based on results of this research it can be concluded that high ratio of n3:n6 in poultry oil couldn’t decrease ascites mortality as compare with soybean oil. %U https://ijas.ut.ac.ir/article_56426_94d75e4a1493922d5a0f848d016897c9.pdf