Deposition of dietary fatty acids, de novo synthesis and anatomical partitioning of fatty acids in finishing pigs.
Predicting aspects of pork quality becomes increasingly important from both a nutritional and technological point of view. The aim of the present study was to provide quantitative information on the relation between nutrient intake and whole-body fatty acid (FA) depositions. This information is essential to develop mechanistic models predicting the FA content of tissues. A serial slaughter study was carried out in which thirty pigs were slaughtered between 90 and 150 kg. The diet included 15 g/kg soyabean oil and contained 44 g/kg fat. Only 0.31 and 0.40 of the digested n-6 and n-3 FA were deposited, respectively. Approximately one-third of the n-3 supply that was deposited resulted from the conversion of 18:3 to other metabolites (i.e. EPA, docosapentaenoic acid and DHA). This proportion was affected by the pig genotype. De novo-synthesised FA represented 0.86 of the total non-essential FA deposition, and its average composition corresponded to 0.017, 0.286, 0.025, 0.217 and 0.454 for 14:0, 16:0, 16:1, 18:0 and 18:1, respectively. Although the average whole-body FA composition was relatively constant during the finishing period, this was not so for the tissues. In the carcass (without backfat), the content of 18:1 increased during the finishing period, whereas that of 16:0 and 18:0 decreased. Backfat captured a proportionally greater fraction of 18:2 than did the carcass of the residual tissues. In contrast, a proportionally greater fraction of the dietary 18:3 supply was deposited in the carcass compared to other tissues.
Kloareg
Maela
M
INRA, UMR Systèmes d'Elevage, Nutrition Animale et Humaine, Saint-Gilles, France.
Noblet
Jean
J
van Milgen
Jaap
J
D000273:Adipose Tissue / Q000378:metabolism*; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001823:Body Composition; D004281:Docosahexaenoic Acids / Q000378:metabolism; D015118:Eicosapentaenoic Acid / Q000378:metabolism; D002149:Energy Intake; D015525:Fatty Acids, Omega-3 / Q000378:metabolism; D043371:Fatty Acids, Omega-6 / Q000378:metabolism; D005231:Fatty Acids, Unsaturated / Q000378:metabolism; D005260:Female; D005838:Genotype; D007082:Ileum / Q000378:metabolism; D050356:Lipid Metabolism; D008297:Male; D008460:Meat; D012737:Sex Factors; D013024:Soybean Oil / Q000008:administration & dosage* / Q000378:metabolism; D013552:Swine / Q000378:metabolism*
D015525:Fatty Acids, Omega-3; D043371:Fatty Acids, Omega-6; D005231:Fatty Acids, Unsaturated; D004281:Docosahexaenoic Acids; D013024:Soybean Oil; D015118:Eicosapentaenoic Acid; C026219:docosapentaenoic acid