飼糧中脂肪含量對肉雞腸道水解及吸收脂肪部位之影響

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Title:	飼糧中脂肪含量對肉雞腸道水解及吸收脂肪部位之影響
Other Titles:	Effect of Dietary Fat Levels on the Hydrolysis and Absorption of Fat Along the Intestinal Tract of Broiler Chickens
Authors:	何重志 HO, CHONG-ZHI
Contributors:	姜樹興 CHIANG, SHU-HSING 畜產與生物科技學系
Keywords:	肉雞;腸道;消失量;消化率;水解率;脂肪酸 Intestinal tract;Disappearance;Digestibility;Hydrolysis rate;Fatty acid;Broiler chickens
Date:	2017
Issue Date:	2018-03-30T01:30:37Z (UTC)
Abstract:	飼料中常額外添加油脂，以提供能量及必需脂肪酸來源。脂肪必須被解脂酶水解後透過腸道吸收，才可被動物利用。本研究為探討飼糧中脂肪含量，對肉雞腸道水解及吸收脂肪部位之影響。160隻24 日齡羅斯肉雞，分配至5 處理，每處理4 重複，每重複8 隻，分別飼予添加0, 2, 4, 6 及8% 大豆油之半純化飼糧。雞隻於35 日齡時犧牲，取出腸道，將腸道分成十二指腸 (D)，空腸前 (J1)、中(J2) 及後 (J3) 段，迴腸前 (I1)、中 (I2) 及後 (I3) 段，共七段，分別收集內容物後，測定各段腸道內容物脂肪水解率、各個脂肪酸消化率及消失量。結果顯示，大部分脂肪在D 即被水解，且不受飼糧脂肪含量之影響 (P>0.05)。脂肪酸之真消化率，在處理×腸道部位之交互作用不顯著 (P>0.05)。總脂肪酸消失量在D 最高，依次為J1 及J2。不飽和脂肪酸於D 消失量最高，而飽和脂肪酸消失量則於J1 最高。綜合以上，飼糧脂肪含量不影響脂肪在肉雞腸道中之水解及吸收部位。脂肪酸主要在十二指腸，空腸前段及中段被吸收，而不飽和脂肪酸較飽和脂肪酸在腸道較快被吸收。 This study was conducted to investigate the effect of dietary fat levelson the hydrolysis and absorption site of fatty acids in the intestine of broilerchickens. One hundred and sixty 24-d-old Ross chickens were allotted to 5treatments with 4 replicates per treatment with 8 chickens per replicate andsupplemented 0, 2, 4, 6 and 8% soybean oil in semi-purified diet,respectively. Chickens were sacrificed at 35-day-old and divided theintestinal tract into duodenum (D), first to third section of jejunum (J1, J2and J3), and first to third section of ileum (I1, I2 and I3). Digesta werecollected to determine the hydrolysis rate of fat, the digestibility anddisappearance of each fatty acids in each intestinal section. The resultsshowed that most of the fat was hydrolyzed at D and it was not affected bydietary fat level (P>0.05). The interaction between the treatment andintestinal section of true digestibility of the fatty acids were not significant(P>0.05). The disappearance of total fatty acid was occurred mainly at D1,J1 and J2. In which the disappearance of USFA and SFA occurred mainlyat D and J1, respectively. In conclusion, dietary fat level did not affect thehydrolysis and absorption site of fat in the intestine. Fatty acids wereabsorbed mainly at D, J1 and J2, and USFA was absorbed faster than SFAwas.
Appears in Collections:	[畜產與生物科技學系所] 碩博士論文

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