AA Saki - Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
Aliarabi H - Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
Cheraghi P - Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran
Mirzaie Goudarzi S - Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

The influence of dietary oxidized oil was studied on laying hen performance, egg quality and blood metabolites.  Experiment was conducted on 160 laying hens (Hy-Line W-36, 54-61 wk of age) in a completely randomized design with five treatments and four replicated cages containing eight birds per cage. Dietary treatments replaced fresh soybean oil in the control diet (3% fresh soybean oil, 15.25% crude protein, and 2858 Kcal/kg metabolizable energy) with 0, 25, 50, 75 and 100% oxidized oil. Egg production and egg weight were recorded daily and feed intake, feed conversion ratio, and egg mass were calculated weekly. Egg quality traits were recorded on a biweekly basis. Hen’s body weight was measured individually at the beginning and end of the experiment. Serum metabolites were determined at the end of the experiment. There was a significant difference between diets with different oxidized oil levels in egg weight, egg mass, Egg production, and feed conversion ratio (P < 0.05). Feed intake was not affected by dietary treatments. There was no significant difference between oxidized oil levels on blood serum triglyceride, total cholesterol, high-density lipoprotein, low-density lipoprotein and very low-density lipoprotein. Malondialdehyde of the liver was not affected by oxidized oils. The results of this study have clearly demonstrated that maximum 25% oxidized oil could be replaced by fresh oil in the diets without any adverse effect on the performance of laying hens.

Laying hen, Oxidized oil, Performance, Blood parameter