This study aimed to assess the levels of crude glycerin (CG) 0, 20, 40, 60 and 80g/kg of dry matter (DM) of sorghum silage on fermentation kinetics, 0, 30, 60 and 90g/kg DM silage on the kinetics of degradation of neutral detergent fiber (NDF), and levels 0, 17, 33, 55 and 70g/kg DM silage on intake and digestibility of DM and nutritional compounds and nitrogen balance in lambs. The volume and rate of digestion of non-fiber carbohydrates (Vcnf) and (Kdcnf), respectively, showed a quadratic Vcnf being estimated maximum (126.62mL/g DM) and Kdcnf minimum (0.0782/h) for inclusion of 54.85 CG 58.75g/kg DM, respectively. Since the time of colonization (L), they presented a linear decrease of 0.013h for each 10g CG/kg. DM linearly decreased from 0.996% degradation for fraction B. There was no significant effect of the inclusion of CG on the intake and dry matter digestibility and nutritional compounds and nitrogen balance. The use of 50CG to 70g/kg DM in diets based on sorghum silage can be an alternative energy source for sheep.
alternative feed; coproduct; glycerol; nutritional value; roughage