| Summary: | 碩士 === 東海大學 === 畜產與生物科技學系 === 101 === Two trials were conducted to examine the effects of different levels or chain lengths of medium-chain triglycerides in diet on fat deposition, fatty acid composition, blood parameters and glucose tolerance of broilers. Trial 1, 600 newly hatched Arbor Acres chicks were allotted to four treatments, six replicates per treatment and 25 chicks per replicate. Chicks were fed diets containing (1) 0; (2) 1.6; (3) 4.0 or (4) 6.4% MCT (containing C6:0, C8:0 and C10:0) for 36 days. Trial 2, 300 newly hatched Arbor Acres chicks were allotted to three treatments, four replicates per treatment and 25 chicks per replicate. Chicks were fed diets containing 4% of (1) soybean oil; (2) coconut oil (containing C12:0) or (3) C6 oil (containin C6:0) for 36 days. Growth performances, abdominal fat deposition, plasma glucose and cholesterol levels, fat content and fatty acid composition of abdominal fat, breast and thigh meat (with skin), and glucose tolerance were measured.Results of trial 1 showed that diet containing 6.4% MCT decreased day 0-36 weight gain and feed intake, abdominal fat deposition and fat content of thigh (with skin) (P<0.05). Feed efficiency and mortality were not affected by the dietary MCT. C8:0 and C10:0 but not C6:0 could be deposited in the tissues. C10:0 had a better deposition efficiency than C8:0 had. Thigh (with skin) had a better deposition efficiency than breast had. Diet containing 6.4% MCT increased plasma total and HDL cholesterol content (P<0.05). Plasma glucose content was not affected but the glucose tolerance was improved (P<0.05) by the dietary MCT.Results of trial 2 showed that diet containing coconut oil or C6 oil did not affect day 0-36 growth performances and abdominal fat deposition. C12:0 but not C6:0 could be deposition in the tissues. Diet containing coconut oil or C6 oil did not affect plasma glucose, cholesterol levels, and glucose tolerance.In conclusion, diet containing C8:0 and C10:0 but not C6:0 or C12:0 could decrease the body fat deposition, increase plasma cholesterol and HDL-cholesterol, and improve the glucose tolerance in broilers. C8:0, C10:0 and C12:0 but not C6:0 could be deposited in the tissues of broilers.
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