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首页> 外文期刊>Asian journal of animal and veterinary advances >Effect of Dietary Energy and Protein on Growth Performance and Carcass Traits of Mamourah Cockerels
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Effect of Dietary Energy and Protein on Growth Performance and Carcass Traits of Mamourah Cockerels

机译：膳食能量和蛋白质对毛m公鸡生长性能和Car体性状的影响

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Background: Dietary energy and protein are the most important determinants of least-cost feed formulation. So, the concurrent increase in feed prices and demand on animal proteins for humans necessitate an urgent need to define the optimal dietary protein and energy levels for growing poultry. Materials and Methods: A study with a factorial arrangement of treatments (2×3) was done to investigate the effects of two dietary protein levels (18 and 20% CP), each with three metabolizable energy levels (3100, 3000 and 2900 kcal ME kg–1) on growth performance, nutrient digestibility, carcass traits and blood parameters of Mamourah cockerels. One hundred eighty birds were randomly allocated to 6 experimental groups, each with three replications and kept in floor pens in an open-sided house. Thus, six diets were formulated and fed to the experimental birds and managed similarly from 6-14 weeks of age. Results: Feeding the 20% CP diets throughout the experiment positively affected feed intake and weight gain of cockerels and negatively affected protein efficiency ratio and economic efficiency compared with the 18% CP diets but feed conversion ratio and efficiency of energy utilization were not affected. Conversely, birds fed the 18% protein diets exhibited significantly higher digestibility of dry matter, organic matter, crude protein and ether extract than those fed the 20% protein diets but digestibility of other nutrients were not altered. Dietary protein level had no effect on almost all carcass traits and blood parameters examined. However, decreasing dietary ME level did not affect feed intake or nutrient digestibility but positively affected growth performance. Carcass traits were not affected by decreasing dietary ME level but when it reached 2900 kcal kg–1 percent abdominal fat was significantly reduced and the percentages of carcass yield, total edible parts and liver were negatively affected. Dietary energy level had no effect on plasma constituents of birds but cholesterol concentration decreased when ME level reduced to 3000 or 2900 kcal kg–1. The interactions between dietary protein and energy levels were not significant for most variables examined. Conclusion: Taking the economic aspect into account, optimal dietary CP and ME levels for growing Mamourah cockerels are suggested to be 20% CP and 3000 kcal kg–1.
机译：背景：膳食能量和蛋白质是成本最低的饲料配方的最重要决定因素。因此，饲料价格的上涨和人类对动物蛋白的需求不断增加，迫切需要为生长的家禽定义最佳的饮食蛋白和能量水平。材料和方法：进行了一项因子分解疗法（2×3）的研究，以研究两种饮食蛋白水平（18和20％CP）的影响，每种饮食蛋白水平具有三种可代谢能量水平（3100、3000和2900 kcal ME） （kg-1）关于Mamourah公鸡的生长性能，养分消化率，car体性状和血液参数。一百八十只鸟被随机分配到六个实验组，每组三个重复，并放在开放式房屋的地板笔中。因此，配制了六种日粮并喂给实验鸟，并在6-14周龄时进行了类似的管理。结果：与18％CP饲料相比，在整个实验过程中饲喂20％CP饲料对公鸡的采食量和体重增加有积极影响，对蛋白质效率比和经济效率有负面影响，但饲料转化率和能量利用效率没有受到影响。相反，饲喂18％蛋白质日粮的禽类比饲喂20％蛋白质日粮的禽类的干物质，有机物，粗蛋白和乙醚提取物的消化率高得多，但其他养分的消化率没有改变。膳食蛋白质水平对几乎所有car体性状和血液参数没有影响。但是，降低饮食中的肌酸水平不会影响饲料的摄入量或营养物质的消化率，但会积极影响生长性能。 decreasing体性状不受日粮ME水平降低的影响，但当其达到2900 kcal kg时，腹部脂肪显着减少1％，and体产量，可食总成分和肝脏的百分比受到负面影响。日粮能量水平对家禽的血浆成分没有影响，但是当ME水平降至3000或2900 kcal kg-1时，胆固醇浓度降低。饮食中的蛋白质和能量水平之间的相互作用对于大多数研究变量而言并不显着。结论：从经济方面考虑，建议使生长中的Mamourah公鸡的最佳日粮CP和ME水平为20％CP和3000 kcal kg-1。

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