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首页> 外文期刊>Tropical Animal Health and Production >Economical and financial analysis of lamb finishing fed with diets formulated according to the NRC (1985) and the NRC (2007).
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Economical and financial analysis of lamb finishing fed with diets formulated according to the NRC (1985) and the NRC (2007).

机译：根据NRC（1985）和NRC（2007）配制的日粮饲喂羔羊肥育的经济和财务分析。

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摘要

This study compares both versions of the nutritional requirement system determined by the National Research Council (NRC) version 1985 (NRC85) and NRC version 2007 (NRC07), for finishing lambs in feedlots. Nineteen crossbred lambs were divided in four groups representing four experimental treatments: one diet according to NRC85 and three diets according to NRC07. The diets recommended by NRC07 considers crude protein intake relative to ruminal undegradable protein at 20, 40, and 60% levels (NRC07/20, NRC07/40, and NRC07/60). Diets were composed of Brazilian semi-arid native grass silage, soybean meal, corn, annatto byproduct, and limestone. Purchases and sales of lambs were done according to average market prices in Brazil. The economic indicators considered pointed that all treatments were viable but NRC07/20 and NRC07/60 were more profitable with similar net present values (NPVs) and internal return rates (IRRs). NRC07/20 was the best option showing an IRR of 17.20% and a payback period (PP) of 5.07 considering a fixed annual interest rate of 6%. Sensitivity analysis considering a 10% raise in variable costs showed negative NPVs, IRRs inferior to the opportunity cost rates adopted and PPs that exceeded the planning horizon of 7 years for both NRC85 and NRC07/40.
机译：这项研究比较了由美国国家研究委员会（NRC）1985版（NRC85）和NRC 2007版（NRC07）确定的两种营养需求系统，用于育肥场的羔羊肥育。将十九只杂种羔羊分为四组，分别代表四种实验处理方法：一种是根据NRC85进行的饮食，另一种是根据NRC07进行的饮食。 NRC07建议的饮食考虑相对于瘤胃不可降解蛋白的粗蛋白摄入量为20％，40％和60％（NRC07 / 20，NRC07 / 40和NRC07 / 60）。饮食包括巴西半干旱本地青贮青贮饲料，豆粕，玉米，安纳托副产品和石灰石。羔羊的买卖是根据巴西的平均市场价格进行的。所考虑的经济指标指出，所有处理方法都是可行的，但NRC07 / 20和NRC07 / 60在具有相似的净现值（NPV）和内部收益率（IRR）的情况下利润更高。考虑到6％的固定年利率，NRC07 / 20是最佳选择，其IRR为17.20％，投资回收期（PP）为5.07。考虑可变成本增加10％的敏感性分析显示，NRC85和NRC07 / 40的NPV均为负值，IRR低于采用的机会成本率，且PP均超过了7年的计划范围。

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