1department of poultry production Focality of Agriculture Ain Shams University
2poultry production Department, Faculty of Agriculture, Ain Shams University
Abstract
ABSTRACT The current study aimed to validate the effect of adding flaxseed oil into Saudi local strain laying hen diets, on their performance, cholesterol and fatty acid profile of egg yolk. The study used 80 layers of Hager 1 local Saudi strain at 31 weeks of age. The hens were allocated into four treatment groups for 12 weeks experimental period. The four groups of layers were fed isocaloric corn-soy basal diet supplemented with, 3% palm oil (T1,control), 2% palm oil + 1% flaxseed oil (T2), 1% palm oil + 2% flaxseed oil (T3) or 3% flaxseed oil (T4). The main results indicated that, egg production percentage and average egg mass increased significantly due to adding 3% flaxseed oil into laying hen diets. The values of egg yolk %, yolk color index, egg albumin% and eggshell% are not affected significantly due to adding flaxseed oil into diets. Flaxseed supplementation significantly reduced plasma and yolk content of cholesterol and plasma triglycerides, while egg triglycerides level was not affected. Inclusion flaxseed oil into layers diets decreased yolk content of saturated fatty acids (SFA) and monounsaturated fatty acids (MUSF). Egg content of polyunsaturated fatty acids (PUSFA) increased clearly. There is a slight increment in linoleic (18:2) fatty acid ratios due to treatment.The increment in linoleic fatty acid is slight because it may be used for synthesis longer chain fatty acids. The ratio of omega3 α-Linolenic fatty acid (C18:3), multiplied due to adding 3% flaxseed oil into laying hen diets. Feasibility study is still needed for evaluating the production of this type of egg economically.
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