The application of lactic acid bacteria (LAB) to crops at ensiling to improve silage quality is a common practice. Homofermentative LAB such as Lactobacillus plantarum, Enterococcusfaecium & Pediococcus spp. are used, with the goal of providing a faster fermentation, lower final pH values, raised lactate:acetate ratios, lower ethanol & ammonia nitrogen concentrations, and improved dry matter recovery . Recently, a heterofermentative LAB inoculant species, Lactobacillusbuchneri, has become available commercially and produces high concentrations of acetic acid in silage, which inhibits fungi & thus preserves silages susceptible to spoilage on exposure to air. Many studies have shown the beneficial effects on ruminant performance of feeding them with silages inoculated with lactic acid bacteria (LAB). These benefits might derive from probiotic effects.