摘要
本文旨在探讨共轭亚油酸（conjugated linoleic acid，CLA）添加水平对肉鸡体脂、体蛋白质沉积和胸、腿肌含量的影响。选择1d艾维因肉鸡360羽，按单因素设计随机分为5个处理，每个处理设6个重复，每个重复12只鸡，分别饲喂添加0％、0．5％、1．0％、1．5％和2．0％CLA的试验日粮。结果表明：在肉鸡生长各阶段CLA能够降低肉鸡体脂沉积，特别是22d以后降低效果明显（P〈0．05），35和49d各添加组分别比对照组降低了16．77％、18．29％、18．60％、19．82％、7．97％、9．89％、12．91％和18．95％；CLA添加能够提高整个生长阶段肉鸡的腿肌率（P〈0．05）、0～35d胸肌率（P〈0．05）和蛋白质的沉积率，但并不影响36-49d胸肌率（P〉0．05），各阶段胸、腿肌率总和与CLA添加水平之间存在明显的二次曲线关系，曲线方程分别为：1～21d阶段，y=-2．0686x^2＋5．0651x＋33．392，（R^2=0．9758，P〈0．05）；22～35d阶段，y=-1．7057x^2＋5．0494x＋36．379，（R^2=0．8302，P〈0．05）；36=49d阶段，y=-1．6943x^2＋3．9346x＋40．421，（R^2=0．9963，P〈0．05）。对以上二次曲线求导，分别得到1～21d、22～35d和36～49d肉鸡获得最佳胸、腿肌率的日粮CLA添加剂量为1．22％、1．48％和1．16％。
To investigate the effect of CLA supplementing level on body fat and protein retention, three hundred and sixty one-day-old avian broiler were selected and allocated to five treatment, each treatment has six replicates of twelve broilers at randomly. The experiment diets were supplemented with 0% ,0.5% ,1.0% ,1.5% and 2.0% CLA respectively. The results showed that in different growth stage of broilers, CLA could decrease body fat retention, especially after 22 d, the effect was significantly （P〈0.05）,35 d and 49 d the abdomen fat rate of supplementing groups were 16.77% ,18.29% ,18.60%, 19.82% ,7.97% ,9.89%, 12.91% and 18.95% lower than control group. CLA supplementing could increase thigh muscle rate in different stage （P〈0.05）, 0-35 d breast muscle rate （P〈0.05） and whole body protein retention, but there was no effect on 36-49 d breast muscle rate （P〉0.05）. There exist a significant quadratic relationship between the sum of thigh muscle and breast muscle rate and CLA supplementing level in different growing stage, the quadratic equation were ： 1-21 d, y = - 2. 068 6x^2 ＋ 5. 065 1x ＋ 33. 392,（R^2 = 0.975 8,P〈0.05） 22-35 d, y = - 1. 705 7x^2 ＋ 5.049 4x ＋ 36. 379,（R^2 = 0. 830 2, P〈0.05） ;36-49 d, y = - 1. 694 3x^2 ＋ 3. 934 6x ＋ 40. 421, （R^2 = 0. 996 3, P〈0.05）respectively;After derivation calculus to above quadratic equation we can get the appropriate CLA supplementing level for obtaining maximum breast and thigh muscle rate of broiler in 1-21 d, 22-35 d and 36-49 d were 1.22% ,1.48% and 1.16%. [Chinese Journal of Animal Nutrition, 2007,19 （1） ： 16- 22 ]
出处
《动物营养学报》
CAS
CSCD
北大核心
2007年第1期16-22,共7页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
湖南省农业厅学科带头人项目(200206)
湖南省人事厅回国人员科研启动项目(200214)
关键词
CLA
体脂沉积
蛋白质沉积
肉鸡
Conjugated linoleic acid （CLA）
Body fat retention
Protein retention
Broilers
