Ghasemi H A, Shivazad M, Mirzapour Rezaei S S, Karimi Torshizi M A
a Department of Animal Science, Faculty of Agriculture and Natural Resources , Arak University , Arak , Iran.
b Department of Animal Science , University of Tehran , Karaj , Iran.
Br Poult Sci. 2016;57(1):71-83. doi: 10.1080/00071668.2015.1098766.
A 42-d trial was conducted to investigate the effect of adding a synbiotic supplement to diets containing two different types of fat on performance, blood lipids and fatty acid (FA) composition and oxidative stability of breast and thigh meat in broilers. A total of 800 one-d-old male broiler chickens were randomly assigned into 1 of 8 treatments with 4 replicates of 25 birds per treatment. The experiment consisted of a 4 × 2 factorial arrangement of treatments including 4 concentrations of synbiotic (0, 0.5, 1 or 1.5 g/kg diet) and 2 types of fat [sunflower oil (SO) or canola oil (CO)] at an inclusion rate of 50 g/kg diet. Dietary fat type did not affect body weight gain (BWG) or feed conversion ratio (FCR) during the overall experimental period (0-42 d). However, fat type modified serum lipid profile and FA composition and 2-thiobarbituric acid-reactive substances (TBARS) content in breast and thigh meat. The addition of synbiotic to the diet linearly improved overall BWG and FCR and also decreased serum cholesterol and low-density lipoprotein cholesterol concentrations. The TBARS value in thigh meat after 30 d of storage at 4°C was linearly decreased as the synbiotic inclusion concentrations in the diets increased. Dietary synbiotic also decreased the proportion of monounsaturated fatty acids and increased n-6 polyunsaturated fatty acid (PUFA) concentration in thigh meat, whereas the FA profile of breast meat was not affected by synbiotic supplementation. Moreover, the PUFA/SFA ratio in the breast meat was linearly increased when synbiotic was included in the CO-containing diets. In conclusion, the addition of synbiotic to broiler diets had a positive effect on growth performance, blood lipid profile and meat quality. The results also support the use of synbiotic to increase the capacity of canola oil for enhancing PUFA/SFA ratio of breast meat in broilers.
进行了一项为期42天的试验,以研究在含有两种不同类型脂肪的日粮中添加合生元补充剂对肉鸡生产性能、血脂、脂肪酸(FA)组成以及胸肉和腿肉氧化稳定性的影响。总共800只1日龄雄性肉鸡被随机分为8种处理中的1种,每种处理有4个重复,每个重复25只鸡。试验由4×2析因处理安排组成,包括4种合生元浓度(0、0.5、1或1.5 g/kg日粮)和2种脂肪类型[葵花籽油(SO)或菜籽油(CO)],添加比例为50 g/kg日粮。在整个试验期(0 - 42天)内,日粮脂肪类型不影响体重增加(BWG)或饲料转化率(FCR)。然而,脂肪类型改变了血清脂质谱、FA组成以及胸肉和腿肉中2-硫代巴比妥酸反应性物质(TBARS)含量。日粮中添加合生元可线性改善总体BWG和FCR,还可降低血清胆固醇和低密度脂蛋白胆固醇浓度。在4℃储存30天后,腿肉中的TBARS值随着日粮中合生元添加浓度的增加而线性降低。日粮中的合生元还降低了腿肉中单不饱和脂肪酸的比例,增加了n-6多不饱和脂肪酸(PUFA)浓度,而胸肉的FA谱不受合生元补充的影响。此外,在含CO的日粮中添加合生元时,胸肉中的PUFA/SFA比值呈线性增加。总之,在肉鸡日粮中添加合生元对生长性能、血脂谱和肉质有积极影响。结果还支持使用合生元来提高菜籽油提高肉鸡胸肉PUFA/SFA比值的能力。