Abstract

A study was conducted to evaluate the effects of different plant extracts (common nettle, coriander, dill and thyme) at various dietary levels (0, 150, 300 and 450 mg/L) on growth performance, carcass traits, blood serum parameters, immune response and ileal microflora of 650 male Ross chickens (13 treatment groups; five replicates/treatment group; 10 birds/replicate) in a 42-day trial. Plant extracts were added to drinking water. Supplementation, except for coriander, increased feed intake (p < .05). Thyme extracts at 300 mg/L improved both weight gain and feed efficiency (p < .05). Thyme or dill (300 mg/L) improved carcass and drumsticks yields (p < .05). Pre-slaughtered body weight was increased by supplementation with plant extracts at 300 mg/L (p < .05). Plant extracts positively affected blood serum parameters decreasing concentrations (p < .05) of total protein, albumin, urea and total cholesterol. Dill extract increased IgG against sheep red blood cells at d 28 (p < .05) and d 42 (IgG; tendency p= .0698), whereas coriander extract (450 mg/L) raised immune response against avian influence within 42 d from vaccination (p < .05). Plant extracts reduced coliforms (except dill at 300 mg/L level; p < .05) and aerobic bacteria (except dill; p < .05). Negative gram bacteria were increased by thyme and dill treatments at 150 mg/L (p < .05) whereas lactobacilli bacteria were raised by thyme at 150 mg/L level (p < .05). In conclusion, supplementation with thyme at 300 mg/L level had the greatest benefits on the evaluated parameters.

• HIGHLIGHTS

• Thyme supplementation at 300 mg/L level could improve broiler chicken growth performance, carcass traits and blood serum parameters.

• Thyme supplementation at 150 mg/L could positively affect ileal microbiota increasing lactobacilli bacteria and reducing coliforms.

• However, no relevant effects of the thyme treatment were observed on broiler chicken immune responses.

摘要

进行了一项研究，以评估不同饮食水平（0、150、300和450 mg / L）不同植物提取物（普通荨麻，香菜，莳萝和百里香）对生长性能，car体性状，血清参数，免疫力的影响在为期42天的试验中，对650只雄性Ross鸡（13个治疗组； 5个重复/治疗组； 10只禽/重复）的反应和回肠微生物区系进行了研究。将植物提取物添加到饮用水中。除香菜外，补充饲料可增加采食量（p <  .05）。300 mg / L的百里香提取物改善了增重和饲料效率（p <  .05）。百里香或莳萝（300 mg / L）可改善car体和鸡腿的产量（p <  .05）。通过添加300 mg / L的植物提取物可以增加屠宰前的体重（p <  .05）。植物提取物可有效降低血清参数，降低 总蛋白，白蛋白，尿素和总胆固醇的浓度（p < .05）。莳萝提取物在d 28（p <  .05）和d 42（IgG;趋势p = .0698）时增加了针对绵羊红细胞的IgG ，而香菜提取物（450 mg / L）在42 d内提高了对禽类影响的免疫应答。疫苗接种（p <  .05）。植物提取物减少了大肠菌群（300 mg / L浓度的莳萝除外；p <  .05）和好氧菌（莳萝除外；p <  .05）。150 mg / L百里香和莳萝处理可增加革兰氏阴性细菌（p < .05），百里香水平升高了乳酸杆菌细菌（p <  .05）。总之，在300 mg / L的水平上添加百里香对评估参数具有最大的好处。

• 强调

• 百里香补充300 mg / L可以改善肉鸡的生长性能，car体性状和血清参数。

• 150 mg / L的百里香补充可以对回肠菌群产生积极影响，增加乳酸杆菌细菌和减少大肠菌群。

• 但是，未观察到百里香处理对肉鸡免疫应答的影响。