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首页> 外文期刊>British Poultry Science >Influence of conditioning temperature on the performance, nutrient utilisation and digestive tract development of broilers fed on maize- and wheat-based diets
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Influence of conditioning temperature on the performance, nutrient utilisation and digestive tract development of broilers fed on maize- and wheat-based diets

机译：调节温度对以玉米和小麦为基础的日粮饲喂肉鸡的性能，养分利用和消化道发育的影响

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1. The influence of conditioning temperature on the performance, nutrient utilisation and digestive tract development of broilers fed on maize- and wheat-based diets was examined up to 21 d of age. The experimental design was a 2 x 3 factorial arrangement of treatments evaluating two grain types (maize and wheat) and three conditioning temperatures (60 degrees C, 75 degrees C and 90 degrees C). Broiler starter diets, each based on one grain (maize or wheat), were formulated and pelleted at the three temperatures. 2. Increasing conditioning temperature decreased the body-weight gain and feed intake in wheat-based diets, but birds fed on maize-based diets conditioned at 60 degrees C and 90 degrees C had higher body-weight gain and feed intake than those fed on the diet conditioned at 75 degrees C. Increasing conditioning temperature increased feed per body-weight gain in both grain-type diets but improved pellet durability index (PDI) only in wheat-based diets; PDI was unaffected in maize-based diets. 3. In wheat-based diets, increasing conditioning temperature decreased the ileal digestibility of nitrogen and starch. Ileal nitrogen digestibility of maize-based diets conditioned at 60 degrees C and 90 degrees C was higher than at 75 degrees C. Starch digestibility was unaffected by conditioning temperature in maize-based diets. No effect of conditioning temperature was found for apparent metabolisable energy (AME). Increasing conditioning temperature decreased digestible protein and AME intakes in wheat-based diets but, in maize-based diets, birds fed on the diet conditioned at 75 degrees C had lower digestible protein and AME intakes compared to those fed on diets conditioned at 60 degrees C and 90 degrees C. 4. Small intestine was longer in birds fed on diets conditioned at 75 degrees C and 90 degrees C compared with those fed on diets conditioned at 60 degrees C. 5. Overall, the data suggest that while the effects of conditioning temperature on body-weight gain and feed intake of broilers to 21 d of age differed depending on the grain type, feed per body-weight gain was adversely affected by higher conditioning temperatures.
机译：1.研究了调节温度对以玉米和小麦为基础的日粮饲喂的肉鸡的生产性能，养分利用和消化道发育的影响，直至21日龄。实验设计是以2 x 3的因子布置方式处理的，用于评估两种谷物类型（玉米和小麦）和三种调节温度（60摄氏度，75摄氏度和90摄氏度）。分别以一种谷物（玉米或小麦）为基础的肉鸡日粮配制并在这三种温度下制粒。 2.提高调节温度会降低小麦日粮的体重增加和采食量，但是以60摄氏度和90摄氏度为条件的玉米日粮喂养的禽类的体重增加和采食量要高于饲喂日粮的鸟。日粮在75摄氏度条件下进行调理。调高温度提高两种谷物型日粮每单位体重增加的饲料，但仅在小麦基日粮中提高了颗粒耐久性指数（PDI）; PDI在玉米饮食中不受影响。 3.在以小麦为基础的日粮中，提高调理温度会降低氮和淀粉的回肠消化率。在60摄氏度和90摄氏度条件下，以玉米为基础的日粮的回肠氮消化率高于75摄氏度。在以玉米为基础的日粮中，调节温度对淀粉的消化率没有影响。对于表观代谢能（AME），未发现调节温度的影响。调节温度升高会降低小麦饮食中的可消化蛋白质和AME的摄入量，但在玉米饮食中，以75摄氏度为条件的饮食喂养的鸟类的消化蛋白质和AME摄入量低于以60摄氏度为条件的饮食喂养的鸟类和摄氏90度。4.与摄氏60度的饮食相比，摄氏75度和摄氏90度的饮食喂养的小肠更长。5.总体而言，数据表明到21 d龄的肉仔鸡体重增加和摄食量的温度因谷物类型而异，较高的调节温度对单位体重增加的饲料有不利影响。

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