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Effects of dietary soybean oil, coconut oil, lard and beef tallow on the composition and structure of triacylglycerol (TG) of abdominal adipose tissue and skin lipids of laying hens were studied. Fatty acid compositions of adipose tissue and skin TG from each dietary group fairly well reflected the fatty acid pattern of respective fats fed to hens. The lipids from soybean oil, lard and beef tallow feeding groups comprised the TG of C50, C52 and C54 as the major TG components, and that from coconut oil feeding group contained large quantity of medium chain length TG of C36-C48 in addition to the C50-C54. Species composition of TG was determined by argentation thin-layer chromatography. The lipids from soybean oil group contained more amounts of TG of U3 and SU2 than that from the other dietary groups, and the lipids from coconut oil group were abundant in TG of S3 and S2U. Generally, C16:0 and C18:0 were preferentially esterified at position 1, and C18:2 was predominated in position 2 of TG from adipose tissue and skin of hens. Short chain fatty acids contained in tissue lipids from coconut oil group were largely distributed in position 3. The most abundant TG in lipids from soybean oil, lard and beef tallow groups was sn-UUU, followed by sn-SUU and sn-UUS, and major components TG of lipid from coconut oil group were sn-SSS, snSUS and sn-USS both in adipose tissue and in skin lipids of laying hens. Conclusively, it was recognized that the influence of dietary fats on the composition and structure of TG appeared more markedly in the adipose tissue than in skin lipids of laying hens.

Changes in composition and structure of triacylglycerol of adipose tissue and skin from laying hens as influenced by dietary fats.