Abstract

Central composite design (CCD; 3 levels and 3 factors) and response surface methodology (RSM) were used to evaluate the average daily body weight gain (ADG) and feed conversion ratio (FCR) in broiler chicks to different levels of dietary sugar beet pulp (SBP), tallow (T) and soybean oil (SO). A total of 60 battery brooder cages of 7 birds each were assigned to 15 diets of CCD containing 3 levels of SBP (0.00, 1.75, 3.50%), T (0.00, 0.50, 1.00%) and SO (0.00, 0.50, 1.00%), from 0 to 14 days of age. The testable outcomes of CCD were fitted with the quadratic model. The response surface analysis showed significant linear, quadratic, and interaction models for ADG and FCR from 0 to 7 and 7 to 14 days of age. At 7 days of age, maximum ADG and minimum FCR were observed with 0.00% of SBP, T, and SO in the diet. At 14 days of age, maximum ADG was obtained at 0.60%, 0.33% and 0.45% of SBP, T and SO in the diet, and the minimum FCR was observed with 0.98%, 0.00% and 1.00% of SBP, T and SO in diet, respectively. The results of this study showed that with increasing age and development of the gastrointestinal tract of broilers, adverse effects of soluble fibres are reduced, and response surface models can explain the correlation among dietary nutrient concentrations and young broiler performance to achieve the optimal target.

• HIGHLIGHTS

• Central composite design reduces the number of trials and the costs.

• The development of the gastrointestinal tract will moderate the adverse effects of dietary soluble fibre.

• By the response surface model, the correlations between dietary nutrients can be explained.

摘要

使用中央复合设计（CCD； 3个级别和3个因素）和响应面方法（RSM）评估了不同水平的甜菜粕对肉鸡的平均日增重（ADG）和饲料转化率（FCR） （SBP），牛脂（T）和豆油（SO）。将总共​​60只电池的育雏笼（每只7只鸟）分配给CCD的15种日粮，其中CCD包含3种水平的SBP（0.00、1.75、3.50％），T（0.00、0.50、1.00％）和SO（0.00、0.50、1.00％） ），年龄介于0到14天之间。CCD的可检验结果符合二次模型。响应面分析显示了0至7日龄和7至14天龄的ADG和FCR的重要线性，二次和交互作用模型。在7日龄时，饮食中的SBP，T和SO为0.00％，观察到最大ADG和最小FCR。在14天大时，日粮中SBP，T和SO的0.60％，0.33％和0.45％获得最大ADG，而日粮中SBP，T和SO的0.98％，0.00％和1.00％分别观察到最小的FCR。这项研究的结果表明，随着年龄的增长和肉鸡胃肠道的发展，可溶性纤维的不良反应减少，响应面模型可以解释日粮营养水平与雏鸡生产性能之间的相关性，以达到最佳目标。

• 强调

• 中央复合设计减少了试验次数并降低了成本。

• 胃肠道的发育将减轻膳食可溶性纤维的不良影响。

• 通过响应面模型，可以解释饮食营养之间的相关性。