Effect of diet, sex and age on fatty acid metabolism in broiler chickens: n-3 and n-6 PUFA.
The PUFA metabolism in broiler chicken was studied through the whole body fatty acid balance method. Four dietary lipid sources (palm fat, Palm; soyabean oil, Soya; linseed oil, Lin; fish oil, Fish) were added at 3 % to a basal diet containing 5 % palm fat. Diets were fed to female and male birds from day 1 to either day 21 or day 42 of age. Birds fed the Lin diet showed a significantly higher 18 : 2n-6 accumulation compared with the other diets (85.2 v. 73.6 % of net intake), whereas diet did not affect 18 : 3n-3 accumulation (mean 63 % of net intake). Bioconversion of 18 : 2n-6 significantly decreased in the order Palm>Lin>Soya>Fish (4.7, 3.9, 3.4 and 1 % of net intake, respectively). The 18 : 3n-3 bioconversion on the Palm and Soya diets was similar and significantly higher than in broilers on the Lin diet (9.1 v. 5.8 % of net intake). The beta-oxidation of 18 : 2n-6 was significantly lower on the Lin diet than on the other diets (10.8 v. 23.3 % of net intake), whereas beta-oxidation of 18 : 3n-3 was significantly higher on the Fish diet than on the other diets (41.5 v. 27.3 % of net intake). Feeding fish oil suppressed apparent elongase and desaturase activity, whereas a higher dietary supply of 18 : 3n-3 and 18 : 2n-6 enhanced apparent elongation and desaturation activity on the PUFA involved in the n-3 and n-6 pathway, respectively. Accumulation of 18 : 2n-6 and 18 : 3n-3 increased and beta-oxidation decreased with age. Sex had a marginal effect on the PUFA metabolism.
Poureslami
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R
Laboratory for Animal Nutrition and Animal Product Quality, Department of Animal Production, Ghent University, Proefhoevestraat 10, 9090 Melle, Belgium.
Raes
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K
Turchini
G M
GM
Huyghebaert
G
G
De Smet
S
S
D000367:Age Factors; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000378:metabolism*; D004032:Diet / Q000662:veterinary*; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage / Q000378:metabolism*; D004063:Digestion; D015525:Fatty Acids, Omega-3 / Q000378:metabolism*; D043371:Fatty Acids, Omega-6 / Q000378:metabolism*; D005260:Female; D008297:Male; D011897:Random Allocation; D012737:Sex Factors
D004042:Dietary Fats, Unsaturated; D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6