title: Economical and financial analysis of lamb finishing fed with diets formulated according to the NRC (1985) and the NRC (2007).
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.
authors: Brazilian Agricultural Research Corporation, Embrapa Goats & Sheep, Estrada Sobral-Groaíras, Km 04, Sobral, Ceará, Brazil. marcosclaudio@cnpc.embrapa.br
authors: Marcos Cláudio Pinheiro
authors: MC
authors: Rogério
authors: Eliane Minervina
authors: EM
authors: de Castro
authors: Espedito Cezário
authors: EC
authors: Martins
authors: Jomar Patrício
authors: JP
authors: Monteiro
authors: Kleibe de Moraes
authors: Kde M
authors: Silva
authors: Magno José Duarte
authors: MJ
authors: Cândido
authors: Tereza Cristina Lacerda
authors: TC
authors: Gomes
authors: Antoine Francis Roux
authors: AF
authors: Bloc
authors: Angela Maria
authors: AM
authors: de Vasconcelos
authors: Eneas Reis
authors: ER
authors: Leite
authors: Hélio Henrique Araújo
authors: HH
authors: Costa
mesh_terms: D000821:Animal Feed / Q000592:standards*; D000822:Animal Husbandry / Q000191:economics*; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D031212:Bixaceae; D001938:Brazil; D001947:Breeding / Q000379:methods; D002119:Calcium Carbonate; D002338:Carotenoids; D004044:Dietary Proteins / Q000032:analysis; D005526:Food, Formulated / Q000592:standards*; D008297:Male; D018803:Models, Economic; D009307:National Academy of Sciences, U.S.; D010936:Plant Extracts; D012756:Sheep / Q000502:physiology*; D012820:Silage; D013025:Glycine max; D014481:United States; D003313:Zea mays
chemical_list: D004044:Dietary Proteins; D010936:Plant Extracts; D002338:Carotenoids; C054041:annatto; D002119:Calcium Carbonate