on performance of animals and feed

on performance of animals and feed intake are well documented, little is known about the effects of glycerol on fermentation pattern and microbes in the rumen. Wang et al. (2009) reported linear increases in rumen propionate and butyrate molar proportions and a linear reduction in acetate to propionate ratio with increasing glycerol doses (100, 200 and 300 g/head/day) in steers’ diet. In contrast, rumen molar proportions for acetate, propionate and butyrate were unaffected by feeding glycerol to beef cattle at levels up to 120/kg of concentrate DM (Mach et al., 2009).