EFFECTS OF DIETARY FATTY-ACID PATTERN ON MELTING-POINT AND COMPOSITION OF ADIPOSE TISSUES AND INTRAMUSCULAR FAT OF BROILER CARCASSES

Soybean oil (SO), rapeseed oil (RO), or two commercial fat products (F P1, FP2) were incorporated at 3.5% levels into four different corn-soy bean meal mash broiler diets. Each of the four diets was fed to five r eplicates (pens) of broiler chickens for 42 d. After slaughtering the birds, samples of the abdominal fat, subcutaneous fat, and fat extract ed from the thigh and the breast portion were collected from 16 birds per treatment. The fat samples were analyzed for their fatty acid comp osition using gas chromatography and the melting point of the abdomina l fat was recorded. The results showed that the abdominal and subcutan eous fat had very similar fatty acid patterns and differed significant ly from the composition of the fat extracted from breast and thigh. Th e different dietary treatments caused significant changes in the fatty acid patterns for all analyzed tissues, although the differences were more pronounced for the adipose tissues. Overall, the adipose tissues contained more polyunsaturated and less saturated fatty acids than th e fat from the breast and thigh portions. The melting point of the abd ominal fat was significantly altered by the use of different dietary f ats: RO gave a lower melting point than SO and FP1; the highest values were recorded for FP2. The data presented here indicate that the sele ction of certain dietary fat sources has a major impact on the composi tion and the melting point of broiler adipose tissues. The effect on t he fatty acid composition of meat portions, however, is limited.