Abstract
The present study investigated the effects of dietary fat sources and feeding level on performance, adipose tissue fatty acid profile and lipid metabolism related genes expression in finisher pigs. A total of 128 finisher pigs [average initial body weight (BW), 81.2±0.322kg] were allotted to 4 treatments on the basis of BW. There were 4 replicates in each treatment with 8 pigs per replicate. Pigs were fed diets containing 50.0g/kg linseed oil or animal fat, either ad libitum or restricted (15.0% less) in 2×2 factorial arrangement for 28d. Dietary fat source did not affect (P>0.05) average daily gain (ADG), average daily feed intake (ADFI) and gain to feed ratio (G:F). The ADG and ADFI of pigs fed ad libitum were greater (P<0.05) than that of restricted fed pigs. The G:F of restricted fed pigs was greater (P<0.05) than that of ad libitum fed pigs. Pigs fed 50.0g/kg linseed oil diet had greater (P<0.05) concentrations of adipose tissue polyunsaturated fatty acids (PUFA) like linoleic acid and α-linolenic acid than that of pigs fed 50.0g/kg animal fat diet. Saturated fatty acids (SFA) like palmitic acid (P<0.05), palmetoleic acid and steric acid (P<0.10) concentrations of adipose tissue were greater in pigs fed animal fat than pigs fed linseed oil. However, adipose tissue fatty acids concentrations were not affected (P>0.05) by feeding level. Adipose tissue expression of acetyl CoA carboxylase (ACC) and fatty acid synthase (FAS) were down-regulated, whereas expression of lipoprotein lipase (LPL) and hormone sensitive lipase (HSL) were up-regulated in finishing pigs fed restricted diets. However, fat sources of diet had no effects (P>0.05) on expression of ACC, FAS, LPL and HSL genes. Results obtained in the present study indicates that dietary inclusion of 50.0g/kg linseed oil have potential to improve the adipose tissue PUFA contents, and 15.0% feed restriction resulted into down-regulation of ACC and FAS and up-regulation of LPS and HSL expression in adipose tissue.
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