ABSTRACT

1. This study was conducted to investigate the effect of particle size of insoluble fibre on growth performance, apparent ileal digestibility (AID) and caecal microbial population in broiler chickens fed barley-containing diets.

2. The dietary treatments included: a barley-based diet (control, CTL) or test diets which contained high-fibre ingredients, either sunflower hulls (SFH), sugarcane bagasse (SB) or wheat bran (WB) ground through a 1.0 (fine) or 3.0 mm (coarse) screen that were added to the control diet at 30 g/kg.

3. For the entire experimental period, insoluble fibre inclusion improved ADG (P < 0.05) and FCR (P < 0.05) compared to the CTL group. Broilers fed SFH had higher (P < 0.05) ADG and better (P < 0.05) FCR than broilers fed SB.

4. Fibre inclusion increased the relative weight of breast and thigh and decreased relative weight of liver compared to the CTL group, but coarse grinding of the SB decreased relative weight of abdominal fat (P < 0.05).

5. The digestibility of nutrients increased with dietary inclusion of insoluble fibre compared to the CTL group. Coarse grinding of SFH increased AID of crude protein compared to the coarse grinding of WB or SB. Fine grinding of various types of fibre improved the AID of fat (as ether extract) and organic matter (P < 0.05).

6. Fine grinding of the WB decreased caecal populations of E. coli. The inclusion of SFH increased caecal populations of Lactobacillus spp. (P < 0.05). Coarse grinding of various types of fibre decreased the caecal population of coliforms (P < 0.05).

7. The inclusion of WB increased digesta viscosity in the ileum compared to samples from the SB and SFH groups (P < 0.05). Coarse grinding of various types of fibre decreased the digesta viscosity in the ileum (P < 0.05).

8. Overall, the data showed that dietary inclusion of insoluble fibre improved growth performance, increased AID of nutrients and decreased ileal viscosity in the birds fed diets containing barley.

摘要

1.本研究旨在研究不溶性纤维的粒径对饲喂含大麦饲料的肉鸡的生长性能，表观回肠消化率（AID）和盲肠微生物种群的影响。

2.饮食疗法包括：大麦为主的饮食（对照，CTL）或测试饮食，其中包含高纤维成分，可以通过1.0碾碎向日葵壳（SFH），甘蔗渣（SB）或麦麸（WB）（或3.0毫米（粗）筛网，以30 g / kg的比例添加到对照饮食中。

3.在整个实验期间，与CTL组相比，不溶性纤维夹杂物改善了ADG（P <0.05）和FCR（P <0.05）。饲喂SFH的肉鸡比饲喂SB的肉鸡具有更高的（P <0.05）ADG和更好的（P <0.05）FCR。

4.与CTL组相比，纤维包裹体增加了乳房和大腿的相对重量，并降低了肝脏的相对重量，但是SB的粗磨降低了腹部脂肪的相对重量（P <0.05）。

5.与CTL组相比，饮食中添加不溶性纤维会增加营养物质的消化率。与WB或SB​​的粗磨相比，SFH的粗磨增加了粗蛋白的AID。对各种类型的纤维进行细磨可以改善脂肪（作为醚提取物）和有机物的AID（P <0.05）。

6.WB的细磨减少了大肠杆菌的盲肠种群。包括SFH增加了乳酸菌盲肠种群。（P ＜0.05）。粗磨各种类型的纤维减少了大肠菌的盲肠种群（P <0.05）。

7.与SB和SFH组的样品相比，WB的增加使回肠的消化道粘度增加（P <0.05）。粗磨各种类型的纤维会降低回肠的消化黏度（P <0.05）。

8.总体而言，数据表明，在饲喂含大麦的禽类中，日粮中添加不溶性纤维可改善生长性能，增加营养成分的AID并降低回肠粘度。