东北玉米肉鸡表观代谢能预测方程的建立

发布时间：2018-08-26 07:39

【摘要】：本研究旨在通过实验室分析和肉鸡代谢试验建立东北玉米养分含量与代谢能的回归方程,为生产提供便捷的玉米代谢能估算方法。试验1:选取成熟季节不同的20种东北玉米,测定养分含量和容重,分析养分含量变异范围。试验2:用玉米、玉米皮、玉米碴按照中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)含量梯度配制人工玉米,再添加一定量的维生素和矿物质,配制成人工玉米代谢饲粮。选取正常饲养的商品代爱拔益加雄性肉鸡进行代谢试验,分别在11~13日龄及25~27日龄,用全收粪法测定人工玉米代谢饲粮表观代谢能(AME)、氮校正表观代谢能(AMEn)和养分表观消化率,并采用逐步回归法建立AME及AMEn与养分含量的回归方程。结果表明:东北玉米粗脂肪(EE)、NDF及ADF含量变异系数相对较大,分别为16.72%、14.65%、14.72%。肉鸡对人工玉米代谢饲粮的养分表观消化率在11~13日龄和25~27日龄之间存在差异,25~27日龄肉鸡对人工玉米代谢饲粮粗蛋白质(CP)、EE和总淀粉(STC)的表观消化率高于11~13日龄,其中EE表观消化率差异显著(P0.05);25~27日龄肉鸡对人工玉米代谢饲粮的AME、AMEn也显著高于11~13日龄(P0.05)。采用逐步回归法建立肉鸡东北玉米代谢能的预测方程为:11~13日龄,AME=17.661-0.853ADF(R2=0.870,P0.01),AM En=17.468-0.878ADF(R2=0.873,P0.01);25~27日龄,AM E=18.102-0.792ADF(R2=0.781,P0.05),AM En=17.935-0.830ADF(R2=0.784,P0.05)。通过预测方程计算所得人工玉米代谢饲粮AME的预测值与实测值很接近,计算所得的东北玉米AME符合预期值。由此得出,不同品种东北玉米EE、NDF及ADF的含量差异相对较大;肉鸡不同阶段玉米代谢能存在差异,计算肉鸡饲粮配方时,不同阶段饲粮代谢能应采用对应的代谢能值;低于14日龄的肉鸡,东北玉米AM E、AM En预测方程分别为AM E=17.661-0.853ADF,AM En=17.468-0.878ADF;14日龄以上的肉鸡,东北玉米AME、AMEn预测方程分别为AME=18.102-0.792ADF,AMEn=17.935-0.830ADF。
[Abstract]:The purpose of this study was to establish regression equations of nutrient content and metabolic energy of Northeast Maize by laboratory analysis and broiler metabolic test, and to provide a convenient method for estimating metabolic energy of maize. Experiment 1: the nutrient content and bulk weight of 20 varieties of Northeast corn in different maturation seasons were determined and the range of variation of nutrient content was analyzed. Experiment 2: artificial corn was prepared according to the (ADF) content gradient of neutral detergent fiber (NDF), acid washing fiber, and then added certain amount of vitamins and minerals to prepare artificial corn metabolic diet. The metabolic tests were carried out in commercial broilers of Aiba Yi + male broilers. The apparent metabolizable energy (AMEn) and apparent digestibility of nutrients (AME),) were measured by the total feces collection method at the age of 11 ~ 13 days and 25 ~ 27 days respectively. The regression equations of AME, AMEn and nutrient content were established by stepwise regression method. The results showed that the coefficients of variation of (EE) and ADF contents in crude fat of northeast maize were relatively large, which were 16.72% and 14.65% and 14.72%, respectively. The apparent digestibility of nutrients in artificial corn diet of broiler chickens was higher than that of 1113 days old and 25 ~ 27 days old broilers, and the apparent digestibility of crude protein (CP) EE and total starch (STC) of artificial corn metabolized diet was higher than that of total starch (STC). The apparent digestibility of EE was significantly higher than that of 1113 days (P0.05). The prediction equation of metabolizable energy of northeast maize was established by stepwise regression method. The prediction equation of metabolizable energy of northeast maize was: AME-17.661-0.853ADF (R2O0.870P0.01) AM En=17.468-0.878ADF (R2O0.873P0.01) AM E=18.102-0.792ADF (R2O0.781P0.05) AM En=17.935-0.830ADF (R2P05). The predicted value of artificial corn metabolic diet AME was very close to the measured value, and the calculated AME of northeast maize was in line with the expected value. It is concluded that the content of EE,NDF and ADF in different varieties of Northeast maize is relatively different, and that there are differences in the metabolic energy of maize in different stages of broiler. When calculating the formula of diet for broilers, the corresponding metabolizable energy should be used in different stages. For broilers under 14 days of age, the prediction equations of AM eon AM En for Northeast Maize were AM E17. 661-0.853 ADFU AM En=17.468-0.878ADF;14 > day old broilers, and AME,AMEn prediction equations for Northeast Maize AME,AMEn were AME=18.102-0.792ADF,AMEn=17.935-0.830ADF., respectively.
【作者单位】：中国农业大学动物科学技术学院动物营养国家重点实验室;
【基金】：长江学者和创新团队发展计划(IRT0945) 北京市家禽创新团队(BAIC04-2016)
【分类号】：S831

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