aDoctoral Program, IREGEP Colegio de Postgraduados Montecillo, Edo. de México, 56230, México.
bInstituto de Investigación de Zonas Desérticas Universidad Autónoma de San Luis Potosí San Luis Potosí, SLP, 78377, México.
cUniversidad Autónoma Metropolitana Unidad Xochimilco, DF, 04970, México.
dCentro de Investigación y Estudios Avanzados del Instituto Politécnico NacionalMéxico City, 07560, México.
*Corresponding autor: jpinos@uaslp.mx.
To evaluate a ruminal buffer and exogenous amylolytic enzymes from Bacillus licheniformis and Aspergillus niger in high concentrate diet, lambs were fed on diet with no additives, or the same diet supplemented with enzymes (0.26% of diet as DM), buffer (1% of diet as DM) or enzymes + buffer in a growth assay. The supplemented diets did not affect intake, BW changes, feed conversion, rumen digestibility and total tract digestion of DM, organic matter (OM) and starch. Ruminal pH values, ammonia N, lactic acid concentrations and molar proportion of acetate and propionate were similar among treatments. Ruminal molar proportion of butyrate of lambs fed enzymes + buffer was lower than those fed control or buffer diets. Thus exogenous amylolytic enzymes did not have any positive effect on growth, rumen digestibility or total tract digestion in lambs.
Amylolytic enzymes, buffer, digestibility, digestion, starch, lambs
