Effect of Different Oil Sources on Muscle Fatty Acid Composition and Serum Lipoproteins Levels in Sarabi Beef Steer

This study examined the effects of different vegetable oil sources on the Fatty Acid (FA) composition of muscle and performance of beef steer (Sarabi strain). Twenty one steers (384±17 kg BW) were assigned in seven treatment that fed diets containing 0% oil (control), 2 and 4% of Canola Oil (CO), Sunflower Oil (SO) and Restaurant Waste Oils (RWO). Ribeye steaks from steers fed CO, SO and RWO for 90 days of experiment were used after slaughtering to evaluate the effects of oil source on fatty acid composition. Amounts of muscle saturated FAs decreased and polyunsaturated FAs increased in both 2% CO and 2% SO groups. The highest contents of total n-3, n-6 and n-7 FAs were significantly (p<0.05) obtained with 2% CO, 2% SO and control groups, respectively. Animals fed 2% CO had the lowest content of total n-9 FAs in compared to other groups. Control and 2% SO dietary groups presented lowest total cholesterol and 4% CO group resulted in a lowest triglycerides (p<0.01). The high and low-density lipoprotein (HDL and LDL) was highest in 2 and 4% RWO group, respectively and animals fed 4% SO and 4% CO had the lowest LDL and very low-DL (VLDL), respectively. Control animals and those fed 2% oils tended to have higher dry matter intake (DMI, <0.05). The best Daily Weight Gain (DWG) was related to 2% RWO dietary group and followed by 2% SO dietary groups; however, differences were not significant.