Effects of Dietary Oil Sources and Levels on growth performances and Conjugated Linoleic Acid Contents in Broilers

• Main Authors: Yueh-Tzung Chiang, 蔣岳宗
• Other Authors: Chanrg-Yih Cheng
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/38197531035982495370

碩士 === 國立屏東科技大學 === 畜產系 === 94 === The aim of this study is to evaluate the effects of dietary oil sources and levels on growth performances and conjugated linoleic acid (CLA) contents in boilers. Three experiments were included in the study. Experiment I: A bath of 900 one-day-old Arbor Acres male boilers were randomly allocated in six treatment groups with 150 birds each. Six replicates were involved within treatment and 25 birds were evaluated for each replicate. Rations for six treatment groups were 2.5% tallow, soybean oil, sunflower seed oil, canola oil, CLA, and CLA and tallow in equal amount combination in addition to basal diet composition. The feeding protocol was classified into three stages based on age, starter (0-2 weeks of age), grower (3-4 weeks of age) and finisher (5 weeks of age) periods. Experiment II: A batch of 450 one-day-old Arbor Acres male boilers were randomly assigned in three treatment groups including six replicates, each with 25 birds. In addition to basal composition, three levels of CLA were added, 1.5, 2.5 and 3.5%, respectively. Similar design was used in Experiment III with CLA replaced by soybean oil. Feed intake and mortality were recorded daily. Birds were weighed weekly. Weight gain and feed conversion rate were then evaluated. Six birds of each treatment group were randomly chosen and slaughtered at 35 days of age for breast and thigh CLA content analysis. Results indicated that broilers fed a ration with tallow and plant oil showed larger weight gain than those with CLA. However, no significant difference of survival rate was observed in this study. Broilers fed tallow added ration had higher production index. CLA content of meat from broilers groups in the descending order was CLA group, CLA and tallow combination group, and plant oil group. Although CLA content in broiler meat increased as CLA content in ration increased as well, no significant difference in growth performance was observed when 1.5-3.5% CLA added to broiler’s ration. Similar result was found in CLA content of broiler meat evaluated when soybean oil included. Furthermore, both weight gain and feed conversion rate during test period were increased when 1.5-3.5% soybean oil added to the ration. Broilers fed ration with 2.5% canola oil had the best CLA production efficiency for meat evaluated in this study when production traits and cost were considered jointly.