Qota, E. M. <br/><br/>
Dietary α-linolenic acid alters n-3 fatty acid metabolism, immunity and cholesterol level in laying hens and their progeny  [electronic resouce]. 
 حامض ألفا اللينولينك بالعلف بغير تمثيل الاحماض الدهنية اوميجا -3 والمناعة ومستوى الكولسترول في الدجاج البياض ونسلة. 

 - p.457-471. 
<br/><br/>Includes references. 
<br/><br/> The aim of this study was to evaluate effects of -linolenic acid (18:3n-3) supplemented diet on fats and fatty acid (FA) metabolism and immune response in the maternal hens and their hatched chicks. One hundred fifty of 30 wks old EL-Salam breeder hens were divided into three groups (5 replicate pens of 10 hens each) and housed in metallic batteries. Three levels (0, 2.5, 5%) of linseed oil (LO) were incorporated, replacing of commercial vegetable oils blend, into practical corn-soybean meal basal diet to provide 3 levels (12.1, 29.4, 47.5%) of 18:3n-3. After 10 wks of the experiment, fertilized eggs were incubated. The hatched chicks from each group were fed a commercial starter diet to estimate immune response and FA profile at 7-d old. The results obtained indicated that feeding LO diets for 12 wks did not affected hens productive performance traits. Lipids and cholesterol levels in hens (yolk, serum, liver) and cholesterol level in chicks liver were reduced (P<.05) with raising dietary LO level. Total n-3 polyun-saturated FA (PUFA, g/100g fat) were gradually increased (P<.01) to constitute in egg yolk 3.5, 9.3 and 17.5%, and in the chicks liver 4.9, 9.7 and 16.6% for 0, 2.5 and 5% LO groups, respectively. Linolenic was the major n-3family in yolks but not in the chicks liver. Long–chain n-3PUFA (20:5n-3, 22:5n-3, 22:6n-3) were, higher values (especially 22:6n-3) in the chicks liver than yolks, gradually increased (P<.01) to constitute in egg yolk 1.3, 2.3 and 4.7% and in the chicks liver 3.1, 6.1 and 10.8% for 0, 2.5 and 5% LO groups, respectively. There was insignificant reductions in saturated (SFA), monounsaturated (MUFA) and n-6PUFA with concomitant increases (P<.01) of n-3PUFA. Immune response of hens or hatched chicks was increased with raising dietary LO level. This study indicates that dietary 18:3n-3 raises n-3PUFA synthesis and immune response and reduces cholesterol level in the maternal hens and their newly hatched chicks. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hens--Feeding and feeds.<br/>Hens--Nutrition.<br/>Low-cholesterol diet.<br/>Acids, Fatty--Metabolism--Regulation.<br/>Linolenic acids.