Resultados econômicos da produção de cordeiros em confinamento utilizando na dieta casca de soja associada a quatro fontes de nitrogênio não-proteico

Abstract

RESUMO -O objetivo neste estudo foi avaliar o custo de produção e a resposta econômica da utilização de casca de soja (CS) associada a duas fontes de nitrogênio não-proteico (NNP) na terminação de cordeiros em confinamento. Foram utilizados 80 cordeiros mestiços Suffolk, com idade inicial de 69 ± 6 dias e peso vivo inicial de 23,11 ± 1,78 kg. Os animais foram distribuídos em quatro grupos, cada um com uma dieta formulada com uma fonte de NNP: grupo ureia convencional, na proporção de 1%; grupo ureia protegida, na proporção de 1%; grupo ureia protegida convencional, na proporção de 1% + 0,5% de ureia convencional, da dieta total, respectivamente; e grupo controle, sem fonte adicional de NNP. O custo total de produção do cordeiro até a desmama foi de R$ 85,27/animal. Entre os componentes desse custo, a categoria de ovelhas foi a principal contribuinte, com 68,55%, seguida pelos custos referentes ao próprio cordeiro (0-67 dias), que representaram 25,57%, e a dos carneiros, com participação de apenas 5,88%. O custo total médio da terminação em confinamento foi de R$ 57,73/cordeiro. Economic results of feedlot lamb using soybean husks associated with different non-protean nitrogen sourcesABSTRACT -The aim of this study was to evaluate the production costs and economic return of soybean husks (CS) associated with two non-protein nitrogen (NNP) sources, in feedlot finishing lamb. Eighty (80) Suffolk cross lambs, averaging initial age of 79 ± 6 days and initial live weight of 23.11 ± 1.78 kg were used. The animals were grouped in four experimental lots accordingly to NNP source: conventional urea group (CUG, n = 20), which received 1% of common urea; protected urea group (PUG, n = 20), which received 1% of protected urea, at the ratio of 1% + 0.5% conventional urea, of total diet, respectively; and control group, with no additional source of NNP. Total production cost (CT) of lambs at weaning was R$ 85.27/animal. In this cost ewes contributed with 68.55%, followed by the lamb cost (0-67 days), which represented 25.57% and rams with only 5.88%.The average CT in feedlot finishing was of R$ 57.73/lamb. Effective operational cost (COEf) represented R$ 57.35 or 99.33%of CT finishing. Variables of higher representativeness of COEf were: ration (61.56%) and taxes (31.06%). Diets with higher positive gross margin (MB)/lamb were GUC and CG (R$ 1.77 and R$ 44.35), respectively. All diets presented negative net margin (ML) and economic return (RE). In finishing systems of feedlot lamb, the use of diets with no additional source of non-protein nitrogen is the option that allows better economic and productivity results.

Anatomic and tissue characteristics in goats fed for extended periods with residue of castor biodiesel production

“…Silva et al (2010) also offered detoxified castor meal to finishing sheep, but for a short period of time, and observed blood urea within the normal physiological limits for the species. Ziguer et al (2012) also observed normal albumin levels in sheep fed soybean hulls for 47 days.…”

Performance and serum chemistry profile of lambs fed on rations with increasing levels of urea

“…Other studies also showed no effect of increasing levels of urea in the diet on the ADG and FCR in lambs (OKAMOTO et al, 2008;ZIGUER et al, 2012). Mean values for ADG, FCR and GFE were 0.225 kg day -1 , 5.33 kg DM kg gain -1 and 0.195 kg gain kg DM -1 , respectively.…”

Intake, Digestibility, Milk Yield and Indicators of the Metabolic Status of Native Ewes Fed Supplemented Diet Under Grazing System

“…The serum urea showed relationship inversely proportional to the concentrate supplementation levels, although there was no difference (P>0.05) between treatments (Ziguer et al, 2012). When breed effect was evaluated, higher values were found for SI ewes (P<0.05).…”