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首页> 外文期刊>British Poultry Science >Effects of exogenous xylanase on performance, nutrient digestibility,
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Effects of exogenous xylanase on performance, nutrient digestibility,

机译：外源木聚糖酶对生产性能，养分消化率，

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1. A previous experiment reported that caecal temperature was negatively correlated with d 49 feed conversion ratio (FCR). This increased temperature in the caeca may indicate a prebiotic effect. An experiment was designed to investigate whether caecal temperature was affected in diets based on maize and whether other portions of the tract were affected.2. A total of 25 Ross 308-d-old male broilers were allocated to each of 8 replicate pens per treatment. Treatments followed a 2x3 factorial design: two diets based on wheat or maize and three levels of enzyme addition, 0, 16000 or 32000 BXU/kg. Growth performance was assessed between d 1 and 49. Digestibility measurements were taken at d 28 and 49. On d 49, the excised small and large intestine of each bird was thermally imaged, weighed and volatile fatty acids (VFA) measured.3. On d 28 and d 49, birds on the maize diets had higher feed intake and weight gain than those offered wheat diets. Additionally, on d 28, birds that received the maize diet had lower FCR than those offered the wheat diet. Enzyme improved FCR at d 49, independently of cereal. On d 28, enzyme improved the coefficient of apparent ileal DM digestibility and the coefficient of apparent ileal nitrogen digestibility. Enzyme only improved apparent ileal digestible energy in wheat-based diets (interactive term). On d 49, all digestibility parameters were improved by enzyme. Enzyme increased gizzard weight in maize-fed birds and the caeca of those fed wheat were heavier. The higher enzyme dose decreased duodenal temperature. In summary of VFA data, wheat-based diets produced more total VFAs and the total amount also increased with enzyme.4. It appears from this study that there is equal potential in both wheat and maize diets for xylanase to improve performance of broilers probably through different mechanisms
机译：1.先前的一项实验报道，盲肠温度与d 49饲料转化率（FCR）呈负相关。盲肠中温度升高可能表明存在益生元效应。设计了一个实验，以研究基于玉米的日粮中盲肠温度是否受到影响以及该道的其他部分是否受到影响。2。每种处理共将25头Ross 308日龄的雄性肉鸡分配给8支重复笔。处理采用2x3析因设计：两种基于小麦或玉米的饮食和三种酶添加水平，分别为0、16000或32000 BXU / kg。在第1天至49天之间评估生长性能。在第28天至49天进行消化率测量。在第49天，对每只鸡切除的小肠和大肠进行热成像，称重并测量挥发性脂肪酸（VFA）。3。在第28天和第49天，采用玉米饮食的鸟类的饲料摄入量和体重增加均高于提供小麦饮食的鸟类。此外，在第28天，接受玉米饮食的鸟类的FCR低于提供小麦饮食的鸟类。酶在第49天改善了FCR，与谷物无关。在第28天，酶改善了表观回肠DM消化率和表观回肠氮消化率。在基于小麦的日粮中（交互作用术语），酶仅能改善表观的回肠可消化能量。在第49天，所有消化率参数均被酶改善。饲喂玉米的鸟类的酶增加了increased的重量，而饲喂小麦的盲肠则较重。较高的酶剂量降低了十二指肠温度。在VFA数据的总结中，以小麦为基础的日粮产生了更多的VFA，并且其总量也随酶而增加。4。从这项研究看来，小麦和玉米日粮中木聚糖酶的潜力可能通过不同的机制来改善肉鸡的生产性能

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