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espanolRESUMEN: Se utilizaron 40 ovejas (31,725 ± 1,44 kg PV inicial) para evaluar la suplementacion (0, 1, 2 y 3%, en base seca de la dieta) de clinoptilolita (ZEOL) en sustitucion de la harina de soya (SBM) en una dieta de finalizacion a base de maiz en el crecimiento, balance energetico de la dieta y caracteristicas de la canal. El experimento duro 56 dias. Para cada porcentaje de sustitucion de SBM por ZEOL, la proteina cruda y la energia neta (EN) de la dieta basal se redujo en 0,37 unidades porcentuales y 0,02 Mcal/kg, respectivamente. No hubo efecto de los tratamientos en la ganancia diaria de peso (GDP), el consumo de materia seca (CMS) o la eficiencia alimenticia (GDP/CMS). La EN de la dieta no se vio afectada por la administracion de ZEOL, pero debido a la caracteristica inerte de ZEOL la relacion de EN dietetica observada-a-esperado aumento linealmente y la proporcion de observado-a-esperado del CMS disminuyo con la suplementacion ZEOL. La clinoptilolita disminuyo linealmente el espesor de la grasa y la grasa visceral, sin efectos en otras medidas de la canal o del peso de los organos (como proporcion de g/kg de peso corporal vacio). La sustitucion de SBM por zeolita hasta 3% no afecto negativamente el crecimiento y las caracteristicas de la canal, resultando que la inclusion de hasta 3% de clinoptilolita en sustitucion de una fuente de alta proteina (SBM) en dietas de acabado tuvo un efecto positivo en la utilizacion de energia de la dieta. EnglishABSTRACT: Forty ewes (31.725±1.44 kg initial LW) were used to evaluate the effects of clinoptilolite (ZEOL) supplementation (0, 1, 2, and 3%, DM basis of diet) as substitute of soybean meal (SBM) in a finishing corn-based diet on growth performance, dietary energetics, and carcass traits. The experiment lasted 56 days. For each percentage of substitution of SBM by ZEOL, the crude protein and net energy (NE) of basal diet were decreased in 0.37 percentage units and 0.02 Mcal/kg, respectively. There were no treatment effects (P>0.27) on average daily gain (ADG), dry matter intake (DMI), and gain efficiency (ADG/DMI). Dietary NE was not affected by ZEOL supplementation (P≥0.69). However, due to the inertness (it does not provide energy) of ZEOL, itself, the ratio of observed-to-expected dietary NE linearly increased (P=0.02) and the ratio of observed-to-expected DMI linearly decreased (P=0.02) with ZEOL supplementation. Clinoptilolite supplementation linearly decreased fat thickness (P=0.02) and visceral fat (P=0.03) with no effects (P≥0.12) on other carcass measures or the organ tissue weights (as proportion of g/kg of empty body weight). Dilution of CP and dietary NE by substitution of SBM by zeolite up to 3% did not negatively affect growth performance and carcass traits. This result suggests that the inclusion of up to 3% of clinoptilolite in substitution of a high protein source (SBM) on finishing diets has a positive effect on the utilization of dietary energy.

austral journal of veterinary sciences

Impact of dietary inclusion of clinoptilolite as substitute of soybean meal on growth performance, dietary energetics and carcass traits of feedlot ewes fed a corn-based diet