Authors : A. Safamehr , N. Aghaei and Y. Mehmannavaz
Abstract: This study was conducted to determine effects of different levels of Fish Oil (FO) on performance, carcass and blood parameters on male broiler chickens. Male broiler wee fed isonitrogenous and isoenergetic diets contain 0, 1, 2 and 3% fish oil levels (treatment of 1, 2, 3 and 4, respectively) ad libitum in both starter (11-21 days) and growth periods. The diets met the requirements recommended by the national research council. The final week (42 to 49 days) removed fish oil from diet. At 42 and 49 days of age, blood samples were randomly collected from the wing vein from three birds per pen. The end of both 42 and 49 days also, before slaughtering, the final body weight and after that, weight of selected organs (breast, thighs, liver, heart, gizzard, spleen and abdominal fat) were recorded individually and presented as a percentage of live weight. The results from this research showed that increasing different levels of fish oil had significant effects on male broiler performance (final weight, weight gain and feed convention ratio) (p<0.01), spleen weight (p<0.05), whereas other parameters of performance (feed intake) and carcass did not show significant differences. In serum biochemical parameters, the birds fed 3% FO (T4) indicated highest High-Dencity Lipoproteins (HDL) and lowest Low-Dencity Lipoproteins (LDL) concentrations than control treatment in 42 days (p<0.01). The level highest of glucose (G) observed in T3 (2% FO) in 42 days old (p<0.05). Total protein (P) and albumin (A) concentration in T4 and globulin (GL) concentration in T3 were lowest. With increasing FO levels, cholesterol (CHOL), triglyceride (TG) and Very Low-Dencity Lipoproteins (VLDL) levels showed non significant decrease in collected samples of 42 days. But, decrease of cholesterol level after one week withdrawal of FO from diet, was significant (p<0.05).
A. Safamehr , N. Aghaei and Y. Mehmannavaz , 2008. The Influence of Different Levels of Dietary Fish Oil on the Performance, Carcass Traits and Blood Parameters of Broiler Chickens. Research Journal of Biological Sciences, 3: 1202-1207.