ABSTRACT

1. This study was conducted to investigate the effect of inactivating GP condensed tannins using graded levels of polyethylene glycol (PEG) on feed intake, physiological, carcase, and meat quality traits of male Cobb 500 broilers.

2. Three hundred, two-week old, male Cobb 500 broilers (334.6 ± 21.43 g live weight) were allocated to 30 pens carrying 10 birds each. Five isonitrogenous and isoenergetic diets were formulated for grower (14–35 d) and finisher (36–42 d) phases by diluting a commercial broiler diet with untreated GP (PEG0) at 6.5% (w/w) or with the same amount of GP but pre-treated with PEG at 2.5% (PEG1), 5% (PEG2), 10% (PEG3) or 15% (w/w) (PEG4) and randomly allocated to pens in a four-week feeding period.

3. Feed intake, weight gain, feed conversion efficiency (FCE), and blood, carcase and meat quality parameters were determined. Weekly weight gain and FCE linearly (P < 0.05) increased in week 4 and linearly (P < 0.05) decreased in week 6 in response to PEG treatment levels.

4. Mean corpuscular volume linearly (P < 0.05) decreased in response to PEG levels, whereas blood urea nitrogen/creatinine ratio, urea, total protein, globulin and cholesterol showed quadratic trends in response to PEG levels. Spleen and ileum weights tended (P < 0.1) to linearly decrease with PEG levels. Heart weight and meat redness tended (P < 0.1) to quadratically respond to increasing levels of PEG.

5. It was concluded that PEG treatment partially inactivated GP condensed tannins without compromising the health status of broiler chickens. An optimum PEG inclusion level could not be determined for feed intake, weight gain and FCE. However, the presence of other antinutrients such as fibre and low molecular weight phenolics in GP may be responsible for the linear decreases observed in this study.

摘要

1.本研究旨在研究使用分级水平的聚乙二醇（PEG）灭活GP缩合单宁对雄性Cobb 500肉仔鸡的采食量，生理，car体和肉质性状的影响。

2.将300只，两周大的雄性Cobb 500肉鸡（活重334.6±21.43 g）分配到30只圈舍中，每只圈养10只鸡。通过以6.5％（w / w）的未经处理的GP（PEG0）或等量的商业用未经稀释的GP（PEG0）稀释商业肉鸡日粮，为生长期（14–35 d）和肥育阶段（36–42 d）配制了五种等氮和等能日粮。 GP，但用2.5％（PEG1），5％（PEG2），10％（PEG3）或15％（w / w）（PEG4）的PEG预处理，并在四周的喂食期内随机分配给围栏。

3.确定饲料摄入量，增重，饲料转化效率（FCE）以及血液，屠体和肉的质量参数。每周体重增加和FCE线性（P <0.05）4周上升和线性（P <0.05）6周响应于PEG治疗水平降低。

4.随着PEG水平的增加，平均红细胞体积呈线性下降（P <0.05），而血尿素氮/肌酐比，尿素，总蛋白，球蛋白和胆固醇随PEG水平呈二次趋势。脾脏和回肠的重量倾向于（P <0.1）随PEG水平线性降低。体重和肉类发红趋向于（P <0.1）对PEG含量的增加呈二次响应。

5.结论是，PEG处理可以使GP浓缩的单宁部分失活，而不会损害肉鸡的健康状况。无法确定饲料摄入量，体重增加和FCE的最佳PEG夹杂物含量。但是，GP中存在其他抗营养物质，例如纤维和低分子量酚类物质，可能是本研究中观察到的线性下降的原因。