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espanolRESUMEN Los efectos de la suplementacion (0, 2, 4, y 6%, en base seca de la dieta) de aceite de nuez purgante (Jatropha curcas, JCO) sobre las caracteristicas de la canal, la composicion tisular y la concentracion de acidos linoleicos conjugados (CLA) en musculo se evaluo en veinte corderos machos intactos, alimentados con una dieta de finalizacion durante un periodo de 56 dias. La proporcion de acido linoleico en JCO fue de 50%. Los corderos fueron faenados con un peso final de 54,03 ± 2,9 kg. No hubo efecto de los tratamientos en el peso de la canal caliente (PCC), el area del musculo longissimus (ML) o la grasa pelvica-renal. Sin embargo, a medida que aumento la suplementacion de JCO, se disminuyo el rendimiento de la canal y aumento el espesor de grasa dorsal. El aumentar JCO en la dieta disminuyo la proporcion del musculo y aumento la proporcion de grasa en la paleta. El contenido de acido estearico (C18:0) en ML no se vio afectado por JCO. Sin embargo, JCO aumento linealmente el total de CLA en ML, y por tanto, la proporcion CLA:C18:0. El peso corporal vacio o la masa visceral no fueron afectados por JCO. El incrementar JCO en la dieta aumento la grasa visceral por el aumento de la grasa mesenterica. Se concluye que la suplementacion con JCO no afecta negativamente el PCC o el area de ML y representa una alternativa viable para aumentar la concentracion total de CLA en la carne de corderos en finalizacion. EnglishABSTRACT The effects of purging nut (Jatropha curcas, JCO) supplementation (0, 2, 4, and 6%, DM basis of diet) on carcass traits, tissue composition and conjugated linoleic acids (CLA) concentration in muscle was evaluated in twenty intact male lambs fed a finishing diet during 56 d. The linoleic acid proportion in JCO was 50%. Lambs were harvested at a final weight of 54.03±2.9 kg. There were no treatment effects on hot carcass weight (HCW), longissimus muscle (LM) area nor kidney-pelvic fat. However, as JCO supplementation increased, dressing percentage was decreased and fat thickness was increased. Increasing JCO in diet decreases the proportion of muscle and increases the proportion of fat in whole shoulder clod. Content of stearic acid (C18:0) in LM was not affected by JCO. However, JCO linearly increased total CLA, and hence, the CLA:C18:0 ratio. Empty body or visceral mass were not affected by JCO. Increasing JCO in diet increases visceral fat mainly through increased mesenteric fat. It is concluded that supplemental JCO does not negatively affect HCW and LM area, and represents a viable alternative for increasing CLA concentration in meat of finishing feedlot lambs.

austral journal of veterinary sciences

Effect of oil supplementation extracted from nontoxic purging nut (Jatropha curcas L) on carcass traits, tissue composition, muscle CLA concentration, and visceral mass of feedlot lambs