Abstract
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.
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Abbreviations
- B/C:
-
Benefit cost ratio
- BW:
-
Body weight
- CP:
-
Crude protein
- CPI:
-
Crude protein intake
- DM:
-
Dry matter
- E:
-
Other operating costs
- EOC:
-
Effective operating cost
- IRR:
-
Internal rate of return
- NPV:
-
Net present value
- NRC:
-
National Research Council
- PP:
-
Payback period
- RUP:
-
Ruminal undegradable protein
- TOC:
-
Total operating cost
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The authors declare for the proper purposes, that the experiments comply with the current laws of Brazil, where they were performed.
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The authors declare that they have no conflict of interest.
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An erratum to this article is available at http://dx.doi.org/10.1007/s11250-014-0555-z.
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Rogério, M.C.P., de Castro, E.M., Martins, E.C. et al. Economical and financial analysis of lamb finishing fed with diets formulated according to the NRC (1985) and the NRC (2007). Trop Anim Health Prod 45, 259–266 (2012). https://doi.org/10.1007/s11250-012-0210-5
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DOI: https://doi.org/10.1007/s11250-012-0210-5