Abstract :
Two experiments were conducted to evaluate the effects of different sources and levels of unsaturated fats on performance in broilers and laying hens. In experiment 1, 336 day old broiler chicks (Ross-308 strain) were used in a completely randomized design for 42 days with 8 treatments in 3 replicates and 14 chicks in each replicate. In experiment 2 288 Hy line (W36) laying hens form 50-62 weeks of age were used in a completely randomized design with 8 treatments in 3 replicates and 12 hens in each replicate. The experimental groups in both experiments included: T1) control group, T2) diet with 4% sunflower oil, T3) diet with 4% canola oil, T4) diet with 4% soybean oil, T5 diet with 2% sunflower oil+ 2% canola oil, T6 diet with 2% sunflower oil + 2% soybean oil, T7) diet with 2% canola oil+ 2% of soybean oil, and finally T8) diet with 1.33% sunflower oil + 1.33% canola oil + 1.33% soybean oil. According to the results, inclusion different sources and levels of vegetable oils in broiler and laying hens rations significantly affected their production performance (p < 0.05). In broilers, the best feed conversion (1.83) was obtained in group 7, whereas the lowest percent of gizzard (2.52%) was observed in group 8. In laying hens the heaviest eggs (57.29g) was resulted in group 5 with 2% sunflower oil+ 2% canola oil, The highest egg color index (4.44) and the lowest egg yolk cholesterol (157mg/100g) were obtained in group 8, the highest eggshell weight (6.48g) was resulted in group 2 and the highest Haugh unit score (95.27) was observed in group 5.
