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The aim of this study was to evaluate the effect of different supplemental levels (0, 1.5, 3 and 4.5%) of zeolite in total mixed finishing diets on the productive response and efficiency of using dietary net energy in hairy lambs. For this aim, 40 ¾Katahdin × ¼Pelibuey lambs (initial weight = 32.28 ± 2.34 kg) were assigned to 20 pens (2 lambs/pen, 5 pens/treatment) and were fed for 75 days on one of the four treatments. Control diet (no supplemental zeolite) contained 16.51% CP and 1.39 McalNEg/kg, and the total quantity of zeolite included replaced corn and soybean meal in equal parts. For each level of which corn and soybean meal were substituted, CP concentration decreased 0.11 percentage points and net energy decreased 0.03 McalNEg/kg. The partial replacement of corn and soybean meal by zeolite at a level of 1.5% in the diet did not affect DM intake, daily gain, feed efficiency, dietary net energy (observed-to- expected diet NE) or the apparent energy retention per unit of dry matter intake (DMI). Increasing the level of zeolite supplementation above 1.5%, increased feed efficiency, dietary net energy and apparent energy retention per unit of DMI averaging 4.5, 6.4 and 7.4%; respectively. The maximun response was obtained for an inclusion level of 3% (quadratic component, p<0.01). Compared to controls, the inclusion of 3% of zeolite in the diet improved (p<0.01) feed efficiency by 6.8%, dietary net energy by 8.4%, and apparent energy retention per unit of DMI by 8.9%. The use of zeolite in finishing diets improves the utilization of dietary net energy. Based on growth performance and efficiency of utilization of dietary net energy, the optimal response observed for lambs in the present study was obtained for the level of 3% of zeolite inclusion.

Efecto de la inclusión de zeolita (clinoptilolita) en ovinos en etapa de finalización: Respuesta productiva y energética de la dieta